Remove unused apps from the DocumentType typeahead
Summary: Ref T10951. This diff removes uninstalled applications from the result set for DocumentType restults
Test Plan: Uninstall an application (diviner for example), then go to the document type search menu and ensure that the uninstalled application doesn't show up.
Reviewers: #blessed_reviewers, epriestley
Reviewed By: #blessed_reviewers, epriestley
Subscribers: epriestley
Maniphest Tasks: T10951
Differential Revision: https://secure.phabricator.com/D16445