Improve appearance page more

Signed-off-by: TheKodeToad <TheKodeToad@proton.me>

launcher/ui/widgets/ThemeCustomizationWidget.h

@@ -33,8 +33,6 @@ class ThemeCustomizationWidget : public QWidget {
     explicit ThemeCustomizationWidget(QWidget* parent = nullptr);
     ~ThemeCustomizationWidget() override;
 
-    void showFeatures(ThemeFields features);
-
     void applySettings();
 
     void loadSettings();