add resetCounter method to player entity and integrate into game reset

src/de/miaurizius/jgame2d/entity/Player.java

@@ -313,6 +313,7 @@ public class Player extends Entity {
     }
     public void restoreStatus() {
         life = maxLife;
+        speed = defaultSpeed;
         invincible = false;
         transparent = false;
         attacking = false;