Fix mobile action menus in Phriction
Summary: Fixes T6963. Long term will likely make this more like other document views, but not worth the time right now since this is only location.
Test Plan: Review Phriction document at desktop and mobile breakpoints. Click menu and see menu.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T6963
Differential Revision: https://secure.phabricator.com/D11420