[Redesign] Fallout cleanup from Merge

Summary: Ref T8099, I think this was just a bum merge, but maybe I missed a commit too.

Test Plan: Poked around a number of new headers and styles, uiexamples, dialogs, etc.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8099

Differential Revision: https://secure.phabricator.com/D12982