R1:f3a2d2b02043

Restore missing ApplicationSearch join clause for Maniphest

Summary: See IRC. This got dropped in the order refactoring.

Test Plan: Ordered Maniphest search results by a custom field.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D12614