R1:14627ad65b89

Fix an incorrectly spelled call on the registration error pathway

Summary: If you copy the registration URL, then register, then load the URL again while logged out (i.e., attempt to reuse the registration URL), we try to show you a tailored error message. However, this call is not correct so we show you a not-so tailored exception instead.

Test Plan:
- Get to the registration screen.
- Save URL.
- Complete registration.
- Log out.
- Return to saved URL.

Previously, exception. Now, readable…