Do not force_auth in login_with_password
This patch revert one part of this merge request: https://gitlab.gnome.org/GNOME/fractal/-/merge_requests/986
It looks like the force_auth is working correctly when restoring the session, but it's not working with the call to client.login, so it cannot be used.
This won't solve the following issue completely: https://gitlab.gnome.org/GNOME/fractal/-/issues/934
The user information can't be getted on the first launch, but it's okay in following launches.