Use proper key name

This key name was incorrectly changed in laravel/socialite#346

src/Two/GoogleProvider.php

@@ -87,7 +87,7 @@ protected function mapUserToObject(array $user)
             'name' => Arr::get($user, 'name'),
             'email' => Arr::get($user, 'email'),
             'avatar' => $avatarUrl = Arr::get($user, 'picture'),
-            'original_avatar' => $avatarUrl,
+            'avatar_original' => $avatarUrl,
         ]);
     }
 }