add resetCounter method to player entity and integrate into game reset

src/de/miaurizius/jgame2d/core/GamePanel.java

@@ -269,6 +269,7 @@ public class GamePanel extends JPanel implements Runnable {
     public void resetGame(boolean restart) {
         player.setDefaultPositions();
         player.restoreStatus();
+        player.resetCounter();
         assetSetter.setNPC();
         assetSetter.setMonster();