MainWindow: Remove unused declaration

src/core/mainwindow.h

@@ -43,7 +43,6 @@
 #include <QString>
 #include <QUrl>
 #include <QImage>
-#include <QPixmap>
 #include <QTimer>
 #include <QtEvents>
 
@@ -290,9 +289,6 @@ class MainWindow : public QMainWindow, public PlatformInterface {
 
   void CheckFullRescanRevisions();
 
-  // creates the icon by painting the full one depending on the current position
-  QPixmap CreateOverlayedIcon(const int position, const int scrobble_point);
-
   void GetCoverAutomatically();
 
   void SetToggleScrobblingIcon(const bool value);