Add 'audit.can-author-close-audit'
Add 'audit.can-author-close-audit'

mattfaus asked on 1s and 0s:

   Is there any way for me to force-close this audit so it stops
   showing up in my diffusion queue? (for example, if the concerned
   party was unavailable for changing their "concern" status to
   "accepted"?)

Well, now there is!

Test Plan:
Fingers crossed

Khan/phabricator,Khan/phabricator,Khan/phabricator,Khan/phabricator