fix build

Signed-off-by: fufesou <shuanglongchen@yeah.net>

src/client.rs

@@ -1753,7 +1753,7 @@ pub fn start_video_audio_threads<F>(
     Arc<AtomicUsize>,
 )
 where
-    F: 'static + FnMut(&scrap::ImageRgb) + Send,
+    F: 'static + FnMut(&mut scrap::ImageRgb) + Send,
 {
     let (video_sender, video_receiver) = mpsc::channel::<MediaData>();
     let video_queue = Arc::new(ArrayQueue::<VideoFrame>::new(VIDEO_QUEUE_SIZE));