fix: modify the csrf_token on disconnection
See the example https://docs.pylonsproject.org/projects/pyramid/en/latest/tutorials/wiki2/authentication.html#add-login-logout-and-forbidden-views
Related MR on CubicWeb cubicweb/cubicweb!722 (merged)
See the example https://docs.pylonsproject.org/projects/pyramid/en/latest/tutorials/wiki2/authentication.html#add-login-logout-and-forbidden-views
Related MR on CubicWeb cubicweb/cubicweb!722 (merged)