Prevent Vikunja from sending mail notifications for failed login attempts if CalDav token is used.
Before, as the provided password value was tested against the user password regardless of whether it was a CalDav token, it triggered a failed login attempt email every three times.
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/1252
Reviewed-by: konrad <k@knt.li>
Co-authored-by: Luca Bernstein <luca@lucabernstein.com>
Co-committed-by: Luca Bernstein <luca@lucabernstein.com>