The default was an empty list which would remove any ~/.ssh/authorized_keys
file and replace it with a symlink to an empty file. On some systems, notably
Ubuntu 22.10, the guix home generated ~/.ssh/authorized_keys file does not
allow login.
* doc/guix.texi (Secure Shell): Update, describe default #false value.
* gnu/home/services/ssh.scm (<home-openssh-configuration>)
[authorized-keys]: Change default to #f.
(openssh-configuration-files): Cater for default #f value: Do not register
"authorized_keys".
c57693846c