Fix Dackka error due to param name mismatch

https://developer.android.com/reference/androidx/leanback/media/PlayerAdapter#seekTo(long)

#minor-release

PiperOrigin-RevId: 496378709

extensions/leanback/src/main/java/com/google/android/exoplayer2/ext/leanback/LeanbackPlayerAdapter.java

@@ -162,8 +162,8 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter implements Runnab
   }
 
   @Override
-  public void seekTo(long positionMs) {
-    player.seekTo(player.getCurrentMediaItemIndex(), positionMs);
+  public void seekTo(long positionInMs) {
+    player.seekTo(player.getCurrentMediaItemIndex(), positionInMs);
   }
 
   @Override