Add filter to Avatax for is_admin() check
I'm using the Woocommerce Avatax extension along with a thrid party plugin called Phone Orders for Woocommerce. On lines 97-99 of the includes/class-wc-avatax-tax-handler.php file there is an if statement that prevents tax calculations on the wordpress admin. When entering an order through the phone orders plugin the Avatax plugin will not calculate any taxes because of that if statement. By commenting out those 3 lines everything seems to work fine. Can a filter be added to this check so that the calculations will be done in the admin if we want them to be? Right now I have those 3 lines commented out and will have to edit the Avatax plugin every time I update it so tax calculations will continue to be done for phone orders.