Add Shipping Address to membership checkout only if Addon Package is included.

hide_pmpro_shipping_level_1.php

<?php
/**
* Add Shipping Address to membership checkout only if Addon Package is included.
*/
function hide_pmpro_shipping_level_1( $level_id ) {
    if ( ! empty( $_REQUEST['ap'] ) ) {
        $hideshipping = false;
    } else {
        $hideshipping = true;
    }
    return $hideshipping;
}
add_filter( 'pre_option_pmpro_shipping_hidden_level_1', 'hide_pmpro_shipping_level_1' );