chore: remove unuseful import (#7849)

Author: asjqkkkk

frontend/appflowy_flutter/lib/workspace/presentation/home/home_stack.dart

@@ -16,7 +16,6 @@ import 'package:appflowy/workspace/presentation/home/home_sizes.dart';
 import 'package:appflowy/workspace/presentation/home/navigation.dart';
 import 'package:appflowy/workspace/presentation/home/tabs/tabs_manager.dart';
 import 'package:appflowy/workspace/presentation/home/toast.dart';
-import 'package:appflowy/workspace/presentation/notifications/number_red_dot.dart';
 import 'package:appflowy_backend/dispatch/dispatch.dart';
 import 'package:appflowy_backend/protobuf/flowy-folder/view.pb.dart';
 import 'package:appflowy_backend/protobuf/flowy-user/user_profile.pb.dart';