Update a factor query in TransactionEditor for providers

Summary: This query didn't get updated and could let you through an explicit "Sign with MFA" action if you have only disabled factors on your account.

Test Plan:

• Disabled all factors.
• Used explicit "Sign With MFA".
  • Before: Went through.
  • After: Sensible error.

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D20072