如何在OpenCart 1.5.6.4中的订单确认电子邮件中添加运费总额

I would like to configure opencart 1.5.6.4 to display shipping cost in the total sum in the order confirmation email sent to the user/client. I'm using the default Cash on Delivery payment with Advanced Shipping PRO module, but not sure if these modules are responsible for the emails sent.

Please, see the attachment - by default it is set to NOT add the shipping cost to the total and it displays it that shipping cost is due on delivery.

opencart order confirmation email doesn't add the shipping cost to total

Here is how it looks on the Checkout Page:

Shipping cost added to total sum on the Checkout page

I would like the shipping cost to be added to the total in the order confirmation email. How can I accomplish this?