Expect camelcase status codes from action=createaccount

Followup to efcf0a3f61b5bcdf5f9f6f716fa732b6afb9336e.
Bug: 61663

Change-Id: I1c8f1b7cd8cdf74b84869d6a58e5f5ca24b62184
(cherry picked from commit bfcd41732d2be412660a4e5b9b877dfcc777b5b0)