fix sorting for default widget

app/controllers/default_widget_controller.rb

@@ -27,7 +27,7 @@ class DefaultWidgetController< OrbitWidgetController
     else #no tag has cate
       result = eval("#{@ori_query}.where(:#{get_category_field_name}.in=>params['category_id'])")
     end
-    result.available_for_lang(I18n.locale).can_display
+    result.available_for_lang(I18n.locale).can_display.desc(:created_at)
   end
 
   def search_result