fix: stone cooldown check needs to check for > 0

src/main/java/uulm/teamname/marvelous/gamelibrary/gamelogic/StoneCooldownManager.java

@@ -50,7 +50,7 @@ public class StoneCooldownManager {
      * @return Whether or not the stone is on cooldown
      */
     public boolean onCooldown(StoneType stone) {
-        return cooldowns.containsKey(stone);
+        return cooldowns.getOrDefault(stone, 0) > 0;
     }
 
     /**