Config - fix management scripts with --database parameter

Summary: Fixes T6923. Turns out we can't use the editor since we don't have a user with a phid (just some omnipotent guy).

Test Plan: ./bin/config set --database syntax.filemap '{}'; ./bin/config delete --database syntax.filemap

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6923

Differential Revision: https://secure.phabricator.com/D11301