R1:14a76526f30b

Rename group to users in project icons

Summary: Fixes T6972.

Test Plan: Set icon to typeahead icon in edit project image

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6972

Differential Revision: https://secure.phabricator.com/D11391