Rendererd buffer count when tunneling enabled

Increasing buffer count when tunneling enabled, for video tracks.
Audio buffer count works fine for both modes.

library/core/src/main/java/com/google/android/exoplayer2/video/MediaCodecVideoRenderer.java

@@ -1830,6 +1830,7 @@ public class MediaCodecVideoRenderer extends MediaCodecRenderer {
       } else {
         handleFrameRendered(presentationTimeUs);
       }
+      decoderCounters.renderedOutputBufferCount++;
     }
 
     @Override