Close pholio mocks

Summary: Fixes T4299, Add status dropdown to mock edit view

Test Plan: Edit mock, close mock, thumbnail title should read (Disabled). Default mocks list should show only open mocks.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: chad, epriestley, Korvin

Maniphest Tasks: T4299

Differential Revision: https://secure.phabricator.com/D9145