Edit page reverting to requester's default pickup service point

Steps to Reproduce:

1. Log into snapshot as diku_admin
2. Go to Users and edit a user and, under Extended information accordion, select a default pickup service point for them (use circ desk 2)
3. Now go to Inventory and find an item
4. From the item's action menu click "add request"
5. In the request, select the user you just edited as the requester
6. Note that circ desk 2 is selected as the pickup service point by default
7. Before saving the request, change that to circ desk 1
8. Save the request
9. Edit the same request

Expected Results: Pickup service point should be circ desk 1

Actual Results: Pickup service point has reverted back to circ desk 2. If you save the request now, the wrong SP will be saved.

Additional Information: This also repros in Goldenrod.
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