Configure pooled players for video playback by default.

app/src/main/java/org/thoughtcrime/securesms/video/exo/SimpleExoPlayerPool.kt

@@ -139,6 +139,8 @@ abstract class ExoPlayerPool<T : ExoPlayer>(
     } else {
       Log.d(TAG, "Failed to get an ExoPlayer instance for tag: $tag")
       null
+    }?.apply {
+      configureForVideoPlayback()
     }
   }