Removes a document from the featured work list when the document is not ...

...public anymore
Hi @hectorcorrea, I added a follow-up comment but it was on an outdated diff.  Doh!  In short, I was wondering if you could use these two methods that are already defined in combination:

`generic_file.visibility_changed? && !generic_file.public?`

And way you're not just doing string comparisons.