On @username mentions in remarkup, show the "busy" dot color
Ref T11809. I missed this when adding a "Busy" status.
Also the other dot is orange? Just make them all orange for consistency.
Test Plan: Viewed @username of busy users (orange), away users (red).
Reviewed By: chad
Maniphest Tasks: T11809
Differential Revision: https://secure.phabricator.com/D16819