Refactor email and password validation logic in LoginForm widget

Update email and password validation logic in the LoginForm widget to only
perform validation when the state is not AuthTokenError. This ensures that
validation is skipped when there is an authentication token error.

lib/utils/bloc_observer.dart

@@ -23,7 +23,7 @@ class MyBlocObserver extends BlocObserver {
 
   @override
   void onClose(BlocBase bloc) {
-    super.onClose(bloc);
     print('onClose -- ${bloc.runtimeType}');
+    super.onClose(bloc);
   }
 }