Remove top-level const qualifiers in function declarations

Signed-off-by: LocalSpook <56512186+LocalSpook@users.noreply.github.com>

launcher/ui/widgets/LanguageSelectionWidget.h

@@ -34,7 +34,7 @@ class LanguageSelectionWidget : public QWidget {
 
    protected slots:
     void languageRowChanged(const QModelIndex& current, const QModelIndex& previous);
-    void languageSettingChanged(const Setting&, const QVariant);
+    void languageSettingChanged(const Setting&, const QVariant&);
 
    private:
     QVBoxLayout* verticalLayout = nullptr;