Improve unit tests (#1782)

lemonldap-ng-portal/t/70-2F-TOTP-8.t

@@ -22,6 +22,7 @@ SKIP: {
                 totp2fSelfRegistration => 1,
                 totp2fActivation       => 1,
                 totp2fDigits           => 8,
+                totp2fTTL              => -1,
             }
         }
     );

lemonldap-ng-portal/t/71-2F-U2F.t

@@ -18,6 +18,7 @@ SKIP: {
                 u2fSelfRegistration => 1,
                 u2fActivation       => 1,
                 portalMainLogo      => 'common/logos/logo_llng_old.png',
+                totp2fTTL           => 2,
             }
         }
     );