refactor: remove redundant IERC165 check

packages/contracts-bedrock/contracts/test/OptimismMintableERC721.t.sol

 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.15;
 
-import { ERC721 } from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import { ERC721, IERC721 } from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import {
+    IERC721Enumerable
+} from "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
 import { IERC165 } from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
 import { Strings } from "@openzeppelin/contracts/utils/Strings.sol";
 import { ERC721Bridge_Initializer } from "./CommonTest.t.sol";
-import { OptimismMintableERC721 } from "../universal/OptimismMintableERC721.sol";
+import {
+    OptimismMintableERC721,
+    IOptimismMintableERC721
+} from "../universal/OptimismMintableERC721.sol";
 
 contract OptimismMintableERC721_Test is ERC721Bridge_Initializer {
     ERC721 internal L1Token;
@@ -47,6 +53,20 @@ contract OptimismMintableERC721_Test is ERC721Bridge_Initializer {
         assertEq(L2Token.version(), "1.0.0");
     }
 
+    function test_supportsInterfaces_succeeds() external view {
+        // Checks if the contract supports the IOptimismMintableERC721 interface.
+        assert(L2Token.supportsInterface(type(IOptimismMintableERC721).interfaceId));
+
+        // Checks if the contract supports the IERC721Enumerable interface.
+        assert(L2Token.supportsInterface(type(IERC721Enumerable).interfaceId));
+
+        // Checks if the contract supports the IERC721 interface.
+        assert(L2Token.supportsInterface(type(IERC721).interfaceId));
+
+        // Checks if the contract supports the IERC165 interface.
+        assert(L2Token.supportsInterface(type(IERC165).interfaceId));
+    }
+
     function test_safeMint_succeeds() external {
         // Expect a transfer event.
         vm.expectEmit(true, true, true, true);

packages/contracts-bedrock/contracts/universal/OptimismMintableERC721.sol

@@ -137,12 +137,8 @@ contract OptimismMintableERC721 is ERC721Enumerable, IOptimismMintableERC721, Se
         override(ERC721Enumerable, IERC165)
         returns (bool)
     {
-        bytes4 iface1 = type(IERC165).interfaceId;
-        bytes4 iface2 = type(IOptimismMintableERC721).interfaceId;
-        return
-            _interfaceId == iface1 ||
-            _interfaceId == iface2 ||
-            super.supportsInterface(_interfaceId);
+        bytes4 iface = type(IOptimismMintableERC721).interfaceId;
+        return _interfaceId == iface || super.supportsInterface(_interfaceId);
     }
 
     /**