R1:b801ca8e6f7f

Author Can Close Audit Option

Summary: Fixes T2339

Test Plan: Close Audit button does not appear if audit.can-author-close-audit option is disabled

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2339

Differential Revision: https://secure.phabricator.com/D4525