Remove normal/undyed shulker boxes from My Items inventories.

Removes the first `_` in the `_SHULKER_BOX` matching to ensure that normal shulker boxes with ID `SHULKER_BOX` are removed from My Items as well.


Co-authored-by: Andreas Troelsen <[email protected]>

src/main/java/com/garbagemule/MobArena/ArenaClass.java

@@ -295,7 +295,7 @@ public class ArenaClass
                 case SHULKER_SHELL:
                     return true;
             }
-            return type.name().endsWith("_SHULKER_BOX");
+            return type.name().endsWith("SHULKER_BOX");
         }
     }
 }