R1:b849f8920d24

Normalize sidebar list hover color

Summary: This normalizes phui-list's hover color to {$blue} like action-list

Test Plan: View a diviner document

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin, chad, avivey

Differential Revision: https://secure.phabricator.com/D8593