Link the "(board)" text after project references in Maniphest

Summary: Fixes T4429. Shows and allows you to click through on board links when a task appears on workboards.

Test Plan:
{F112837}

Clicked the links.

Reviewers: chad, btrahan

Reviewed By: chad

CC: chad, aran

Maniphest Tasks: T4429

Differential Revision: https://secure.phabricator.com/D8226