Update BauGUI

Signed-off-by: yoyosource <yoyosource@nidido.de>

BauSystem_Main/src/de/steamwar/bausystem/features/gui/BauGUI.java

@@ -39,7 +39,7 @@ import java.util.*;
 public class BauGUI {
 
     @Getter
-    private static final HashMap<Integer, BauGuiItem> ITEMS = new HashMap<>();
+    private static final Map<Integer, BauGuiItem> ITEMS = new HashMap<>();
 
     private static final Set<Player> OPEN_INVS = new HashSet<>();
     private static boolean updating = false;