Restore ExternalPlayer visibility when restoring instance state

app/src/main/java/de/danoeh/antennapod/activity/MainActivity.java

@@ -309,6 +309,15 @@ public class MainActivity extends CastEnabledActivity {
         outState.putInt(SAVE_BACKSTACK_COUNT, getSupportFragmentManager().getBackStackEntryCount());
     }
 
+    @Override
+    protected void onRestoreInstanceState(Bundle savedInstanceState) {
+        super.onRestoreInstanceState(savedInstanceState);
+
+        if (getBottomSheet().getState() == BottomSheetBehavior.STATE_EXPANDED) {
+            bottomSheetCallback.onSlide(null, 1.0f);
+        }
+    }
+
     @Override
     public void onStart() {
         super.onStart();