fixed immersive mode when resuming

src/org/love2d/android/GameActivity.java

@@ -80,9 +80,8 @@ public class GameActivity extends SDLActivity {
     }
 
     @Override
-    public void onWindowFocusChanged(boolean hasFocus) {
-      super.onWindowFocusChanged(hasFocus);
-      if (hasFocus) {
+    public void onResume() {
+      super.onResume();
       getWindow().getDecorView().setSystemUiVisibility(
           View.SYSTEM_UI_FLAG_LAYOUT_STABLE
           | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
@@ -91,7 +90,6 @@ public class GameActivity extends SDLActivity {
           | View.SYSTEM_UI_FLAG_FULLSCREEN
           | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
     }
-    }
 
     public static String getGamePath() {
       Log.d ("GameActivity", "called getGamePath(), game path = " + gamePath);