fix/light-dark-themes

Signed-off-by: Collecting <collecting@noreply.localhost>

src/citron/util/performance_overlay.h

@@ -12,6 +12,7 @@
 #include <QColor>
 #include <memory>
 #include <deque>
+#include "citron/uisettings.h"
 
 class GMainWindow;
 
@@ -25,6 +26,9 @@ public:
     void SetVisible(bool visible);
     bool IsVisible() const { return is_visible; }
 
+public slots:
+    void UpdateTheme();
+
 protected:
     void paintEvent(QPaintEvent* event) override;
     void resizeEvent(QResizeEvent* event) override;