R1:0bb1cf921805

Tweak logo hover color again.

Summary: The dark highlight was bothering me, I'm assuming it probably bothered others but hadn't come up yet.

Test Plan: Hover reload hover reload hover.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4143