Fix issue #662 - Fix nav bar color in light mode

app/src/main/java/app/fedilab/android/activities/MediaActivity.java

@@ -495,10 +495,10 @@ public class MediaActivity extends BaseTransparentActivity implements OnDownload
     // except for the ones that make the content appear under the system bars.
     private void showSystemUI() {
         View decorView = getWindow().getDecorView();
-        decorView.setSystemUiVisibility(
+        decorView.setSystemUiVisibility(flags |
                 View.SYSTEM_UI_FLAG_LAYOUT_STABLE
-                        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
-                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
+                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
     }
 
     public FragmentMedia getCurrentFragment() {