login on 'Enter' (#6819)

Signed-off-by: fufesou <shuanglongchen@yeah.net>

flutter/lib/common/widgets/login.dart

@@ -599,6 +599,7 @@ Future<bool?> loginDialog() async {
         ],
       ),
       onCancel: onDialogCancel,
+      onSubmit: onLogin,
     );
   });