fix log message for min-expires in registrar

kamailio/registrar-role.cfg

@@ -408,9 +408,8 @@ route[REGISTRAR_BOUNDS]
     if($var(expires) != 0) {
        if($sel(cfg_get.kazoo.registrar_error_min_expires) == 1) {
            if($var(expires) < REGISTRAR_MIN_EXPIRES) {
-               $var(expires) = REGISTRAR_MIN_EXPIRES;
-               xlog("L_WARNING", "$ci|end|expires $var(expires) too brief registering $Au from IP $si:$sp\n");
-               append_to_reply("Min-Expires: $var(expires)\r\n");
+               xlog("L_WARNING", "$ci|end|expires $var(expires) too brief (configured $def(REGISTRAR_MIN_EXPIRES)) registering $Au from IP $si:$sp\n");
+               append_to_reply("Min-Expires: $def(REGISTRAR_MIN_EXPIRES)\r\n");
                send_reply("423", "Interval Too Brief");
                exit;
            }