Fixed position of setLevel(0) call

SpigotCore_Main/src/de/steamwar/inventory/SWAnvilInv.java

@@ -72,7 +72,6 @@ public class SWAnvilInv {
     }
 
     public void addCloseCallback(Runnable callback) {
-        player.setLevel(0);
         builder.onClose(p -> callback.run());
     }
 
@@ -85,6 +84,7 @@ public class SWAnvilInv {
         if(s.startsWith("»"))
             s = s.substring(1);
         callback.accept(s);
+        player.setLevel(0);
         return Collections.singletonList(AnvilGUI.ResponseAction.close());
     }
 }