R1:a07628031fb5

Use Labels in Policy PHUIX controls

Summary: Makes labels display as labels instead of disabled controls.

Test Plan: Test editing a policy in Maniphest. New UI displayed.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12576