SI: Tax Exempt Customers Not Honored in Store Administration Order Manager

[WillStrohl]

Steps to Reproduce:

1. Clean installation of Hotcakes 03.01.00 (affects earlier versions as well).
2. Add a tax schedule.
3. Add at least one product to the catalog that is in the tax schedule.
4. Add at least one customer and mark this customer as tax exempt.
5. As a merchant, choose the menu option to add a new order in the Orders menu.
6. Add the product that is assigned to the tax schedule.
7. Choose the customer that is tax exempt.
8. Enter an address for the customer that matches the tax schedule.
9. Choose the shipping option.
10. Click the Update button to update the order.

Expected Behavior:
The order grand total reflects a value without tax calculated. This would be the same expected behavior as the front-end checkout, when a customer places an order themselves.

Actual Behavior:
The order total summary shows tax calculated and applied to the grand total.

[WillStrohl]

Passed QA