R1:7e78a3f90609

Make Workboard icon grey if not enabled

Summary: Not sure this is obvious enough, but maybe future apps will use as well?

Test Plan: test a project with and without a workboard

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11371