Update the log tag of DefaultAudioSink

The old tag reflects the original name of this class. It was renamed in
2017:
<unknown commit>

Possibly the old name was kept for compatibility with existing logs
analysis? I didn't see an explicit discussion of this in the review
comments of the rename change.

The current tag confused me slightly - I assumed a line was being
emitted by the android.media.AudioTrack rather than ExoPlayer's
DefaultAudioSink.

PiperOrigin-RevId: 345450056

library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java

@@ -259,7 +259,7 @@ public final class DefaultAudioSink implements AudioSink {
    */
    */
   private static final int AUDIO_TRACK_RETRY_DURATION_MS = 100;
   private static final int AUDIO_TRACK_RETRY_DURATION_MS = 100;
 
 
-  private static final String TAG = "AudioTrack";
+  private static final String TAG = "DefaultAudioSink";
 
 
   /**
   /**
    * Whether to enable a workaround for an issue where an audio effect does not keep its session
    * Whether to enable a workaround for an issue where an audio effect does not keep its session