How to remove a Royalty address from the nft contract

So I recently created an nft collection and after already creating the contract and minting 1,000 nft's I saw in the source code that it's creator (hashlips) had a line of code that collects 5% fee:

 function withdraw() public payable onlyOwner {
    // This will pay HashLips 5% of the initial sale.
    // You can remove this if you want, or keep it in to support HashLips and his channel.
    // ============================================================================
    (bool hs, ) = payable(0x943590A42C27D08e3744202c4Ae5eD55c2dE240D).call{value: address(this).balance * 5 / 100}("");
    require(hs);
    // ============================================================================
    
    // This will payout the owner 95% of the contract balance.
    // Do not remove this otherwise you will not be able to withdraw the funds.
    // ============================================================================
    (bool os, ) = payable(owner()).call{value: address(this).balance}("");
    require(os);
    // ============================================================================   }

I removed it afterwards and compiled it in remix and now it looks like this:

function withdraw() public payable onlyOwner {
    // ============================================================================
    (bool os, ) = payable(owner()).call{value: address(this).balance}("");
    require(os);
    // ============================================================================   }

The problem is that I read that you cant change the source code of a contract that has already been deployed, so it doesnt matter that I removed it afterwards and compiled the file in remix. He will still get the 5% fee when I withdraw from the contract address to mine.
The collection is on Opensea and I've set a 3.5% fee there.
Is it possible to somehow remove royalty addresses from a contract that has been deployed, or do I have to create a new contract with the correct source code and mint the nft's again?

full code:

// SPDX-License-Identifier: GPL-3.0



pragma solidity >=0.7.0 <0.9.0;

import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol"; import "@openzeppelin/contracts/access/Ownable.sol";

contract NFT is ERC721Enumerable, Ownable {   using Strings for uint256;

  string public baseURI;   string public baseExtension = ".json";   uint256 public cost = 0.025 ether;   uint256 public maxSupply = 10000; uint256 public maxMintAmount = 10000;   bool public paused = false;   mapping(address => bool) public whitelisted;

  constructor(
    string memory _name,
    string memory _symbol,
    string memory _initBaseURI   ) ERC721(_name, _symbol) {
    setBaseURI(_initBaseURI);
    mint(msg.sender, 100);   }

  // internal   function _baseURI() internal view virtual override returns (string memory) {
    return baseURI;   }

  // public   function mint(address _to, uint256 _mintAmount) public payable {
    uint256 supply = totalSupply();
    require(!paused);
    require(_mintAmount > 0);
    require(_mintAmount <= maxMintAmount);
    require(supply + _mintAmount <= maxSupply);

    if (msg.sender != owner()) {
        if(whitelisted[msg.sender] != true) {
          require(msg.value >= cost * _mintAmount);
        }
    }

    for (uint256 i = 1; i <= _mintAmount; i++) {
      _safeMint(_to, supply + i);
    }   }

  function walletOfOwner(address _owner)
    public
    view
    returns (uint256[] memory)   {
    uint256 ownerTokenCount = balanceOf(_owner);
    uint256[] memory tokenIds = new uint256[](ownerTokenCount);
    for (uint256 i; i < ownerTokenCount; i++) {
      tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
    }
    return tokenIds;   }

  function tokenURI(uint256 tokenId)
    public
    view
    virtual
    override
    returns (string memory)   {
    require(
      _exists(tokenId),
      "ERC721Metadata: URI query for nonexistent token"
    );

    string memory currentBaseURI = _baseURI();
    return bytes(currentBaseURI).length > 0
        ? string(abi.encodePacked(currentBaseURI, tokenId.toString(), baseExtension))
        : "";   }

  //only owner   function setCost(uint256 _newCost) public onlyOwner {
    cost = _newCost;   }

  function setmaxMintAmount(uint256 _newmaxMintAmount) public onlyOwner {
    maxMintAmount = _newmaxMintAmount;   }

  function setBaseURI(string memory _newBaseURI) public onlyOwner {
    baseURI = _newBaseURI;   }

  function setBaseExtension(string memory _newBaseExtension) public onlyOwner {
    baseExtension = _newBaseExtension;   }

  function pause(bool _state) public onlyOwner {
    paused = _state;   }    function whitelistUser(address _user) public onlyOwner {
    whitelisted[_user] = true;   }
    function removeWhitelistUser(address _user) public onlyOwner {
    whitelisted[_user] = false;   }

  function withdraw() public payable onlyOwner {
    // ============================================================================
    (bool os, ) = payable(owner()).call{value: address(this).balance}("");
    require(os);
    // ============================================================================   } }