Hide the banner dismiss link on banners in Sitewide Sales. Requires Sitewide Sales v1.3+

my_swsales_swsales_banner_dismiss_link_html.php

<?php
/**
 * Hide the banner dismiss link on banners in Sitewide Sales.
 */
function my_swsales_swsales_banner_dismiss_link_html( $banner_dismiss_link_html, $banner_info ) {
	// Hide dismiss link for top banner location only.
	if ( $banner_info['location'] === 'top' ) {
		$banner_dismiss_link_html = '';
	}
	return $banner_dismiss_link_html;
}
add_filter( 'swsales_banner_dismiss_link_html', 'my_swsales_swsales_banner_dismiss_link_html', 10, 2 );