Event Tickets Plus: Add extra line breaks to the end of the WooCommerce order email message.

functions.php

<?php

/**
 * Event Tickets Plus: Add extra line breaks to the end of the WooCommerce order email message.
 *
 * @link https://gist.github.com/cliffordp/46ffc5eb2fdfd7a76114ba72fba5b358
 * @link https://theeventscalendar.com/support/forums/topic/ticket-email-subject/
 *
 * @see Tribe__Tickets_Plus__Commerce__WooCommerce__Main::add_tickets_msg_to_email()
 */
add_filter( 'wootickets_email_message', function ( $message ) {
	$message .= '<br><br>';

	return $message;
} );