R1:ff89843034e0

Fix white + icon hover / apps create

Summary: Decided to just remove the hover grey to white, seems fine with the new white icons.

Test Plan: use homepage + icons

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D6181