Merge pull request #408 from orz12/opt-deep-router-danmaku

尝试优化视频导航有多层时弹幕所占资源

lib/pages/video/detail/view.dart

@@ -213,6 +213,8 @@ class _VideoDetailPageState extends State<VideoDetailPage>
       videoIntroController.isPaused = true;
       plPlayerController!.removeStatusLister(playerListener);
       plPlayerController!.pause();
+      plPlayerController!.danmakuController?.pause();
+      plPlayerController!.danmakuController?.clear();
     }
     super.didPushNext();
   }