message: ctp: remove unnecessary require
  There was a leftover require from when the contract
  was `initializable`. This commit removes that because
  it is no longer needed.
diff: @@ -68,11 +68,6 @@ contract OptimismMintableERC721Factory is Semver {
  "OptimismMintableERC721Factory: L1 token address cannot be address(0)"
  );
  - require(
  - bridge != address(0),
  - "OptimismMintableERC721Factory: bridge address must be initialized"
  - );
  -
  OptimismMintableERC721 localToken = new OptimismMintableERC721(
  bridge,
  remoteChainId,
  