Widen PHUIPropertyListView when ActionList isn't attached

Summary: This makes PHUIPropertyList display wider when an ActionList isn't present.

Test Plan: Review Diff Details in a Diff. Test mobile and desktop layouts.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D13568