chore(group): fix delay show group when switch and convert to relative import

lib/bloc/group_detail_bloc.dart

@@ -1,8 +1,8 @@
 // ignore_for_file: use_build_context_synchronously
 
 import 'dart:async';
-
 import 'package:flutter/widgets.dart';
+
 import '../feature/devices/device_model.dart';
 import '../product/base/bloc/base_bloc.dart';
 import '../product/services/api_services.dart';