修复视频拖动进度条后倍速重置问题

lib/video.dart

@@ -334,13 +334,13 @@ class GZVideoPlayerState extends State<GZVideoPlayer>
           }
         }
       }
+      _controller.setPlaybackSpeed(_speedItem.speed);
     }
   }
 
   void _handleInit(_) {
     debugPrint("初始化完成");
     setVolume(_volume.value);
-    _controller.setPlaybackSpeed(_speedItem.speed);
     widget.onInit?.call(_controller);
     _initialized = true;
     setState(() {});