system/device-table: do not set /home/default stgid

Currently, /home/default is mode 2755 which means it is setgid.
Since /home/default is not group-writable, it is useless.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Acked-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>