R1:ff7a514af38c

Minor, increase spacing on buttons

Summary: Increase space, other visual polish

Test Plan: Check UIExamples on buttons and button bar. View policy controls.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D10886