Fix FightserverPortal deletion

src/de/steamwar/lobby/portal/FightserverPortal.java

@@ -192,6 +192,8 @@ public class FightserverPortal implements PortalHandler, Comparable<FightserverP
     public void delete() {
         portals.get(gamemode).remove(this);
         hologram.delete();
+        blueNPCs.forEach(NPC::delete);
+        redNPCs.forEach(NPC::delete);
         handler.delete();
     }