tests: fix test_pam_preauth_cert_no_logon_name()
Currently a name is provided for test_pam_preauth_cert_no_logon_name()
so it is not a no-logon-name test. This patch removes the name and adds
the now missing mocked reply manually.
Reviewed-by: Fabiano FidĂȘncio <fidencio@redhat.com>