fix stations were not drawn

src/balancing/ArenaView.h

@@ -43,6 +43,7 @@ private slots:
 private:
     void drawTiles(QPainter& painter);
     void drawBuildings(QPainter& painter);
+    void drawStations(QPainter& painter);
     void drawScrap(QPainter& painter);
     void drawShips(QPainter& painter);
     void drawBeams(QPainter& painter);