R1:44a412db9a70

Alight button bar icons better

Summary: We make buttons slightly wider by default, but didn't move these icons.

Test Plan: Review ButtonBar UIExamples, Button Examples, and Inline Commenting

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12653