Remove duplicated call to index customization

The statement executed the method twice if the `present?` condition was
true. If the condition was false, it executed it once anyway.

It's probably a typo and originally we probably meant we wanted to
execute the method if the method existed.

app/controllers/concerns/commentable_actions.rb

@@ -16,7 +16,7 @@ module CommentableActions
 
     @resources = @resources.page(params[:page]).send("sort_by_#{@current_order}")
 
-    index_customization if index_customization.present?
+    index_customization
 
     @tag_cloud = tag_cloud
     @banners = Banner.in_section(section(resource_model.name)).with_active