bug 1291892 - Branch tests for pre_social_login
bug 1291892 - Branch tests for pre_social_login

KumaSocialAccountAdapter.pre_social_login will have more uncovered
branches when is_open_for_signup cleans up the session.

ollie314/kuma,jwhitlock/kuma,mozilla/kuma,safwanrahman/kuma,ollie314/kuma,Elchi3/kuma,jwhitlock/kuma,safwanrahman/kuma,SphinxKnight/kuma,yfdyh000/kuma,SphinxKnight/kuma,escattone/kuma,mozilla/kuma,a2sheppy/kuma,jwhitlock/kuma,Elchi3/kuma,SphinxKnight/kuma,jwhitlock/kuma,mozilla/kuma,ollie314/kuma,a2sheppy/kuma,a2sheppy/kuma,yfdyh000/kuma,safwanrahman/kuma,Elchi3/kuma,ollie314/kuma,yfdyh000/kuma,a2sheppy/kuma,yfdyh000/kuma,safwanrahman/kuma,SphinxKnight/kuma,jwhitlock/kuma,safwanrahman/kuma,ollie314/kuma,SphinxKnight/kuma,escattone/kuma,a2sheppy/kuma,escattone/kuma,yfdyh000/kuma,Elchi3/kuma,yfdyh000/kuma,mozilla/kuma,ollie314/kuma,safwanrahman/kuma,mozilla/kuma,Elchi3/kuma,SphinxKnight/kuma