fix: custom data not set properly

Author: hypixeloffical

src/main/java/dev/dfonline/codeclient/hypercube/actiondump/VarItem.java

@@ -12,8 +12,11 @@ public ItemStack getItem(String id, JsonObject data) {
 
         DFItem dfItem = DFItem.of(item);
         dfItem.editData(itemData -> {
-            itemData.setHypercubeStringValue("id", id);
-            itemData.setHypercubeStringValue("data", data.toString());
+            JsonObject varItemData = new JsonObject();
+            varItemData.addProperty("id", id);
+            varItemData.add("data", data);
+
+            itemData.setHypercubeStringValue("varitem", varItemData.toString());
         });
         return dfItem.getItemStack();
     }