Fix the type of message passed with MSG_PLAYBACK_INFO_CHANGED

The receiving code was updated in:
https://github.com/google/ExoPlayer/commit/7b82a3c8892a2b90fa1121dc6bfad7817ae03944
but this sending site was missed.

PiperOrigin-RevId: 320173033

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImpl.java

@@ -591,9 +591,7 @@ import java.util.concurrent.TimeoutException;
       applicationHandler
           .obtainMessage(
               ExoPlayerImplInternal.MSG_PLAYBACK_INFO_CHANGED,
-              /* operationAcks */ 1,
-              /* positionDiscontinuityReason */ C.INDEX_UNSET,
-              playbackInfo)
+              new ExoPlayerImplInternal.PlaybackInfoUpdate(playbackInfo))
           .sendToTarget();
       return;
     }