Fix offhand simulator

BauSystem_Main/src/de/steamwar/bausystem/features/simulator/TNTSimulatorListener.java

@@ -95,7 +95,7 @@ public class TNTSimulatorListener implements Listener {
 
     @EventHandler
     public void onPlayerMove(PlayerMoveEvent e) {
-        if (!ItemUtils.isItem(e.getPlayer().getInventory().getItemInMainHand(), "simulator")) {
+        if (ItemUtils.isItem(e.getPlayer().getInventory().getItemInMainHand(), "simulator")) {
             simulatorShowHide(e.getPlayer(), i -> null, PlayerInventory::getItemInMainHand, e.getTo());
         } else {
             simulatorShowHide(e.getPlayer(), i -> null, PlayerInventory::getItemInOffHand, e.getTo());