Use Doritos™ Brand® perfect circles to indicate Busy/Away/Disabled

Summary:
Fixes T11829.

• Currently in use: Doritos™ Brand® "Nacho Cheese"® perfect circles: •
• Available alternative: Doritos™ Brand® "Cool Ranch"® perfect circles: ●

Test Plan: {F1913116}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11829

Differential Revision: https://secure.phabricator.com/D16834