feat(player): 评论发布成功提示

lib/pages/player/widgets/comment_composer_sheet.dart

@@ -129,6 +129,7 @@ class _CommentComposerSheetState extends State<CommentComposerSheet>
     );
     if (!mounted) return;
     if (result.isSuccess) {
+      _input.clear();
       _closing = true;
       Navigator.pop(context, true);
       return;