Normalize ActionList dropdowns

Summary: Normalizes the display of the ActionList menu on mobile and tablet, shifts them to being actual menu dropdowns instead of an inline list.

Test Plan:
Verify DocumentView, Profiles, and Tasks all display the Action Menu in an identical way.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12373