Fix ConcurrentModificationException

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

FightSystem_Core/src/de/steamwar/fightsystem/record/PacketProcessor.java

@@ -612,7 +612,7 @@ public class PacketProcessor implements Listener {
     }
 
     private void tick(){
-        entityServer.tick();
+        execSync(entityServer::tick);
 
         if(!source.async() && !skipToSubtitle)
             tickFinished = true;