Fix tnt outside arena

Signed-off-by: Lixfel <agga-games@gmx.de>

FightSystem_Core/src/de/steamwar/fightsystem/listener/DenyWorldInteraction.java

@@ -70,7 +70,7 @@ public class DenyWorldInteraction implements Listener {
 
     @EventHandler
     public void handleEntityExplode(EntityExplodeEvent event) {
-        if(Config.ArenaRegion.inRegion(event.getLocation()))
+        if(!Config.ArenaLeaveable || Config.ArenaRegion.inRegion(event.getLocation()))
             event.setCancelled(true);
     }