Backport #27585 by @JakobDev
Fixes https://codeberg.org/forgejo/forgejo/issues/1592
When login in with WebAuth, the page has a link to use TOTP instead.
This link is always displayed, no matter if the User has set up TOTP or
not, which do of cause not work for those who have not.
Co-authored-by: JakobDev <jakobdev@gmx.de>