chore(ui): remove duplicate exports

Signed-off-by: xsahil03x <[email protected]>

Author: xsahil03x

packages/stream_chat_flutter/lib/src/attachment/attachment.dart

@@ -1,5 +1,4 @@
 export 'attachment_error.dart';
-export 'attachment_error.dart';
 export 'attachment_upload_state_builder.dart';
 export 'attachment_widget.dart' show AttachmentSource;
 export 'file_attachment.dart';

packages/stream_chat_flutter/lib/stream_chat_flutter.dart

@@ -83,8 +83,6 @@ export 'src/scroll_view/photo_gallery/stream_photo_gallery_tile.dart';
 export 'src/scroll_view/stream_scroll_view_empty_widget.dart';
 export 'src/scroll_view/stream_scroll_view_indexed_widget_builder.dart';
 export 'src/scroll_view/user_scroll_view/stream_user_grid_tile.dart';
-export 'src/scroll_view/user_scroll_view/stream_user_grid_tile.dart';
-export 'src/scroll_view/user_scroll_view/stream_user_grid_view.dart';
 export 'src/scroll_view/user_scroll_view/stream_user_grid_view.dart';
 export 'src/scroll_view/user_scroll_view/stream_user_list_tile.dart';
 export 'src/scroll_view/user_scroll_view/stream_user_list_view.dart';