bug#43720: Reconfiguring does not create home directories

[Andreas Enge]

Hello,

when adding new users to a Guix system configuration and reconfiguring,
their home directories are not created. It has happened a few times when
creating accounts for interns on bayfront, and it has happened right now
with Danny's account on dover.

This behaviour seems to contradict the documentation at
   https://guix.gnu.org/manual/en/guix.html#User-Accounts

Andreas