remove verification handled automatically by web

Author: lohanidamodar

templates/flutter/lib/src/client_browser.dart.twig

@@ -141,13 +141,6 @@ class ClientBrowser extends ClientBase with ClientMixin {
   return FlutterWebAuth.authenticate(
       url: url.toString(),
       callbackUrlScheme: "appwrite-callback-" + config['project']!,
-    ).then((value) async {
-      Uri url = Uri.parse(value);
-      final key = url.queryParameters['key'];
-      final secret = url.queryParameters['secret'];
-      if (key == null || secret == null) {
-        throw AppwriteException(
-            "Invalid OAuth2 Response. Key and Secret not available.", 500);
-      }
-    });  }
+    );
+  }
 }