Uninstalling an application, as a non-admin, should give the same modal as clicking "Edit Policies"

Summary: Fixes T8893, Uninstalling an application, as a non-admin, should give the same modal as clicking "Edit Policies".

Test Plan: Open /applications/view/PhabricatorAuditApplication/ and confirm that "Edit Policies" and "Uninstall" result in the same modal.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T8893

Differential Revision: https://secure.phabricator.com/D13753