Tweak audit status colors.

Summary: Fixes T3242. Changes the red and orange objects to match the transactions. Also adds a highlight color to 'cards'.

Test Plan: Review my audits in my sandbox

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T3242

Differential Revision: https://secure.phabricator.com/D6184