Incorrect requisition costs in nearly all demo-data requisitions

As shown in the screenshot below, the current codebase seems to always show a value of $0.00 for the “Total Cost for Full Supply Items” row within requisitions’ PDF representations. It's likely that the other costs are also misrepresented.

Reproduction steps:

1. Log into the application as administrator.

2. Go to Requisitions > View and search for demo-data requisitions (they exist for Balaka District Hospital, Comfort Health Clinic and Kankao Health Facility).

3. Open any demo-data requisition.

4. Print the requisition.

5. All requisition costs amount to 0 in the PDF.

Expected results:

• All requisition costs should the same in printed demo-data requisitions as on the UI.