Remove unused mailtag in badges

Summary: grep for MAILTAG_NAME in badges, not used.

Test Plan: view edit preferences, grep

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D13887

src/applications/badges/storage/PhabricatorBadgesTransaction.php

@@ -10,7 +10,6 @@ final class PhabricatorBadgesTransaction
   const TYPE_STATUS = 'badges:status';
   const TYPE_FLAVOR = 'badges:flavor';
 
-  const MAILTAG_NAME = 'badges:name';
   const MAILTAG_DETAILS = 'badges:details';
   const MAILTAG_COMMENT = 'badges:comment';
   const MAILTAG_OTHER  = 'badges:other';