Rever overflow-x on property lists

Summary: I keep finding edge cases where this is causing issues, like PHUITagView in Audit as a property. Going to revert.

Test Plan: Review an Audit, tag is not cut off.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D10740