Return the contributor admin ID when serializing other locations

[jwalgran]

Overview

Profile page URLs are constructed using the ID of the admin user for the contributor. We update the serialization of the "Other locations" section of the facility detail page to be consistent with other places in the app where we create profile page links.

Connects #949

Testing Instructions

Setup

• Checkout the develop branch
• Run ./scripts/resetdb and ./scripts/server
• Browse http://localhost:8081/admin/api/contributor/ and delete the contributor with the (2) suffix on the name (which should be at the bottom of the list.
• Browse http://localhost:8081/admin/api/contributor/15/change/ and change "Admin" to c2@example.com. Note the name of the contributor.
• Browse http://localhost:6543/?q=regina and select the facility in Shenzhen.
• Click the contributor link under "Other locations" and verify that it incorrectly links to /profile/15 and displays an empty page.
• Checkout this branch, browse http://localhost:6543/?q=regina, and select the Shenzhen facility again.
• Click the contributor link under "Other locations" and verify that it correctly links to /profile/2

Checklist

• fixup! commits have been squashed
• CI passes after rebase
• CHANGELOG.md updated with summary of features or fixes, following Keep a Changelog guidelines

[rajadain]

+1 tested, works correctly. Nice job adding the tests!

[jwalgran]

Thanks for the review.