fix: remove invalid timeout parameters from test cases

Jest's it() function doesn't accept timeout as third parameter with async callbacks.
Removed invalid timeout arguments from two test cases that were causing TypeScript errors.

Author: hanzel98

ui/components/multichain/network-list-menu/network-list-menu.test.tsx

@@ -496,7 +496,7 @@ describe('NetworkListMenu', () => {
           NETWORK_TYPES.MAINNET,
         ),
       );
-    }, 30000);
+    });
 
     it('fires setNetworkClientIdForDomain when test network item is clicked', async () => {
       const state = {
@@ -668,6 +668,6 @@ describe('NetworkListMenu', () => {
       await waitFor(() => expect(mockUpdateCustomNonce).toHaveBeenCalled());
       await waitFor(() => expect(mockSetNextNonce).toHaveBeenCalled());
       await waitFor(() => expect(mockDetectNfts).toHaveBeenCalled());
-    }, 30000);
+    });
   });
 });