Make profile icon gender neutral and remove from login link in Vector

See https://trello.com/c/NbPpjduW/565-update-user-icon-in-vector

Bug: 41484
Bug: 45056
Change-Id: I62c9aef54bde85c236bf8b2fb0458b4a3fe0dcf2
Merge "Make profile icon gender neutral and remove from login link in Vector"