fix: removed unused imports

frontend/app_flowy/lib/workspace/presentation/plugins/grid/src/grid_page.dart

@@ -1,7 +1,6 @@
 import 'package:app_flowy/startup/startup.dart';
 import 'package:app_flowy/workspace/application/grid/grid_bloc.dart';
 import 'package:app_flowy/workspace/application/grid/row/row_service.dart';
-import 'package:flowy_infra/size.dart';
 import 'package:flowy_infra/theme.dart';
 import 'package:flowy_infra_ui/style_widget/scrolling/styled_list.dart';
 import 'package:flowy_infra_ui/style_widget/scrolling/styled_scroll_bar.dart';
@@ -12,7 +11,6 @@ import 'package:flowy_sdk/protobuf/flowy-folder/view.pb.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter/material.dart';
 import 'package:linked_scroll_controller/linked_scroll_controller.dart';
-import 'package:provider/provider.dart';
 import 'controller/grid_scroll.dart';
 import 'layout/layout.dart';
 import 'layout/sizes.dart';