Fix worldscript error, fixes #426

... how did this even...

Whoever made this, please test code you add before committing!

src/main/java/net/aufdemrand/denizen/scripts/containers/core/WorldScriptHelper.java

@@ -3446,7 +3446,7 @@ public void playerInteractEntity(PlayerInteractEntityEvent event) {
                 itemMaterial.identify());
 
         if (entity.getBukkitEntity() instanceof ItemFrame) {
-            dItem itemFrame = new dItem(((ItemFrame) entity).getItem());
+            dItem itemFrame = new dItem(((ItemFrame) entity.getBukkitEntity()).getItem());
             dMaterial itemFrameMaterial = itemFrame.getMaterial();
             context.put("itemframe", itemFrame);