R1:80327a550ab1

Fix PropertyList background color in PHUIDocumentView

Summary: Overzealous nuking.

Test Plan: Test Phriction, Phame, Diviner. All show property lists correctly.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D14439