Refresh order review on billing email changes

Refresh order review upon billing email changes.

add_action( 'woocommerce_after_checkout_form', function (){
    ?>
    <script type="text/javascript">
        jQuery( function( $ ) {
            $(document).ready(function() {
                $( document.body ).on( "blur", "#billing_email", function() {
                    jQuery(document.body).trigger("update_checkout");
                });
            });
        });
    </script>
    <?php
});