R1:293607950c6a

Reinstate AphrontFormCountedToggleButtonsControl's CSS

Summary: Undoes accidental delete from https://secure.phabricator.com/D5314

Test Plan: View awesome new toggle-buttons scheme in Releeph.

Reviewers: chad

Reviewed By: chad

CC: epriestley, aran

Differential Revision: https://secure.phabricator.com/D5332