Update Nav Settings on Layout Widget Update

Fixes https://www.pivotaltracker.com/story/show/82883346

The job that normally fires off a navigation settings update job wasn't happening for navigation type widgets within layout widgets. This was happening because that widget didn't have a website yet. It didn't have a website yet because it's "parent" widget hadn't saved it's id in a setting yet. I realize that this is very confusing. I can discuss in person next week...but, I have confirmed it's working here https://g5-cms-1soj8z7v-g5-selfstorage.herokuapp.com/blues-street-self-storage/privacy-policy