Can't login when mfa is installed

[emteknetnz]

This change caused a regression - I can no longer login to the CMS when the MFA module is installed

After I do a brand new install When I got to /admin And I type my user/pass in Then I'm redirected to where I just was

PRs

• https://github.com/silverstripe/silverstripe-mfa/pull/484

[maxime-rainville]

All done.