Fix issue with over- and under-supply values missing from UNA administrative vector

[phargogh]

This PR addresses an issue with the sample data when running UNA with search radii defined per population group. The fields Pund_adm and Povr_adm, per the User's guide, are supposed to be the sum of over- and under-supplied populations across all population groups, but these values just weren't being summed in the output vector. This has been corrected and test values updated.

Fixes #1512

Checklist

• Updated HISTORY.rst and link to any relevant issue (if these changes are user-facing)
• Updated the user's guide (if needed)
• Tested the Workbench UI (if relevant)

[dcdenu4]

Looks fairly straightforward to me, thanks @phargogh !