Phriction - fix bug with delete

Summary: Fixes T6489. In an earlier diff I forgot to update the document status itself, thinking that the content update percolated up magically. Restore this functionality so the wiki works better.

Test Plan: deleted a document and observed that i did not get the option to delete it again and it disappeared from document index

Reviewers: epriestley, chad

Reviewed By: chad

Subscribers: Korvin, epriestley

Maniphest Tasks: T6489

Differential Revision: https://secure.phabricator.com/D10807