I am using the anti-splog plugin and I want to use

Hi, I am using the anti-splog plugin and I want to use the rename wp-signup.php shortcode [ust_wpsignup_url] in my nav menu. I have found a plugin to do this but the code does not work with wp 3.8.1, here is the plugin code:

<?php
/*
Plugin Name: Shortcodes in Menus
Description: Allows you to add shortcodes in WordPress Navigation Menus
Plugin URI: http://wordpress.org/plugins/shortcode-in-menus/
Version: 1.0
Author URI: http://gagan.pro
Author: Gagan Deep Singh
*/

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

/**
* Allows shortcode to be saved in database
*/
function gs_sim_allow_saving_shortcode_custom_links( $url, $orig_url, $context ){
if($context=='db'){
return $orig_url;
}
return $url;
}

function gs_sim_security_check(){
if(current_user_can('activate_plugins')){
//Conditionally adding the function for database context for
add_filter( 'clean_url', 'gs_sim_allow_saving_shortcode_custom_links', 10, 3 );
}
}
add_action('wp_loaded','gs_sim_security_check');

/**
* Allows shortcode to be processed and displayed
*/
function gs_sim_allow_display_shortcode_custom_links( $url, $orig_url, $context ){
if( $context=='display' ){
return do_shortcode($orig_url);
}
return $url;
}
add_filter( 'clean_url', 'gs_sim_allow_display_shortcode_custom_links', 10, 3 );

When I hover over the custom menu link I am getting: http://sboweb.com.au/ust_wpsignup_url

can someone help with this?

Thanks