Fix query in default widget for tags

app/controllers/default_widget_controller.rb

@@ -18,7 +18,7 @@ class DefaultWidgetController< OrbitWidgetController
       if params["category_id"].blank?
         result = @tag.send(ori_class_name.downcase.pluralize)
       else
-        result = @tag.send(ori_class_name.downcase.pluralize).where(:category_id=>params["category_id"])
+        result = @tag.send(ori_class_name.downcase.pluralize).where(get_category_field_name(ori_class_name) => params['category_id'])
       end
     elsif params["category_id"].blank?
         result = eval(@default_widget["query"])