Fix incorrect key for error bag. (#360)

* Fix incorrect key for error bag.

* Ensure backwards compatibility

* Update FailedTwoFactorLoginResponse.php

Co-authored-by: Taylor Otwell <taylor@laravel.com>

Author: vaibhavpandeyvpz

src/Http/Responses/FailedTwoFactorLoginResponse.php

@@ -23,6 +23,9 @@ public function toResponse($request)
             ]);
         }
 
-        return redirect()->route('two-factor.login')->withErrors(['email' => $message]);
+        return redirect()->route('two-factor.login')->withErrors([
+            'code' => $message, 
+            'email' => $message
+        ]);
     }
 }