Make pink flags pink

Summary:
Indigo apparently used to be pink and was fixed in D10707.

This looks like it never got changed

Test Plan: Flag was purple, then it was pink

Reviewers: chad, Blessed Reviewers

Reviewed By: chad, Blessed Reviewers

Subscribers: epriestley, Flags

Differential Revision: https://secure.phabricator.com/D12101