R1:e16080ce7e6c

Fix typo in DifferentialRevisionCommandeerTransaction

Test Plan: Check at /applications/mailcommands/PhabricatorDifferentialApplication/revision/

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D17265