Use buildUpon instead of creating new overrides in UI ControlView.

Creating a new set of overrides removes previously set overrides that
should be kept.

Issue: google/ExoPlayer#9690
PiperOrigin-RevId: 409933541

library/ui/src/main/java/com/google/android/exoplayer2/ui/StyledPlayerControlView.java

@@ -2165,7 +2165,9 @@ public class StyledPlayerControlView extends FrameLayout {
               TrackSelectionParameters trackSelectionParameters =
               TrackSelectionParameters trackSelectionParameters =
                   player.getTrackSelectionParameters();
                   player.getTrackSelectionParameters();
               TrackSelectionOverrides overrides =
               TrackSelectionOverrides overrides =
-                  new TrackSelectionOverrides.Builder()
+                  trackSelectionParameters
+                      .trackSelectionOverrides
+                      .buildUpon()
                       .setOverrideForType(
                       .setOverrideForType(
                           new TrackSelectionOverride(
                           new TrackSelectionOverride(
                               track.trackGroup, ImmutableList.of(track.trackIndex)))
                               track.trackGroup, ImmutableList.of(track.trackIndex)))