R1:0e2cb6e7c437

Fix missing URI for "OAuthServerClient" object handles, causing dialog with no button

Summary:
Ref T13330. Handles for "OAuthServerClient" objects currently do not have a URI, which causes some obscure fallout like a missing "Close" button when examining their transactions.

Add a URI.

Test Plan:
- Viewed an OAuth server client detail page.
- Edited a policy, changing it to a custom policy.
- Clicked "Custom Policy" in the resulting transaction to view a dialog explaining the changes.
- Before…