rPc300f0e87416

Update Google icon on Auth Provider page

Summary: Closes T15479

Test Plan: Go to `/auth/config/new/` in browser and look at icons.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: speck, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15479

Differential Revision: https://we.phorge.it/D25297