WooCommerce PDF Voucher - Disable custom background for storefront theme

woo-vou-disable-custom-background.php

<?php // Do not add this if it's already added in your theme

// Remove storefront custom backgroud image which appears on pdf when previewing/downloading
function remove_featured_images_from_child_theme() {

	if( isset( $_GET['post_type'] ) && $_GET['post_type'] == 'woovouchers' ) {
		remove_theme_support( 'custom-background' );
	}        
}
add_action( 'after_setup_theme', 'remove_featured_images_from_child_theme', 11 );