Improve CSRF token test

lemonldap-ng-manager/lib/Lemonldap/NG/Manager/Conf/Tests.pm

@@ -529,8 +529,8 @@ sub tests {
         # Warn if XSRF token TTL is higher than 10s
         formTimeout => sub {
             return 1 unless ( defined $conf->{formTimeout} );
-            return ( 0, "XSRF form token TTL must be higher than 10s" )
-              unless ( $conf->{formTimeout} > 10 );
+            return ( 0, "XSRF form token TTL must be higher than 30s" )
+              unless ( $conf->{formTimeout} > 30 );
             return ( 1, "XSRF form token TTL should not be higher than 2mn" )
               if ( $conf->{formTimeout} > 120 );