Iconic Delivery slots: Don't delete timeslot data from the order when it is cancelled.

functions.php

<?php

/**
 * Iconic Delivery slots: Dont delete timeslot data from the order when it is cancelled.
 *
 * @return void
 */
function iconic_wds_dont_delete_timeslot_data_when_order_is_cancelled() {
	remove_action( 'woocommerce_order_status_changed', array( 'Iconic_WDS_Order', 'status_changed' ), 10 );

}
add_action( 'init', 'iconic_wds_dont_delete_timeslot_data_when_order_is_cancelled' );