Show login form instead of no access message when members are logged out

show_login_form.php

<?php
/**
 * Show a simple login form if users are logged out and a post/page requires membership
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function pmpro_show_login_form(){
   return wp_login_form();
}
add_filter('pmpro_not_logged_in_text_filter', 'pmpro_show_login_form');