Adjusts the nesting of the /auth/cas/callback specs
Adjusts the nesting of the /auth/cas/callback specs

This allows them to share the same describe block

LabSEC/omniauth-cas,identification-io/omniauth-cas,1dtouch/omniauth-cas,CruGlobal/omniauth-cas,txstate-etc/omniauth-cas,dlindahl/omniauth-cas,ikbear/omniauth-cas,tduehr/omniauth-cas3