Fix display of admin "new value" in accountadmin script
Summary: I broke this when converting to PhabricatorUserEditor.
Test Plan:
Ran accountadmin, created an admin account, verified the "new value" column showed "Y".
ACCOUNT SUMMARY OLD VALUE NEW VALUE Username derp Real Name derprp Email derp@derp.com Password Unchanged Admin N Y
Reviewers: btrahan, nikil
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T1434
Differential Revision: https://secure.phabricator.com/D2908