data: Update gnome-session file for gnome-settings-daemon 3.23

gnome-settings-daemon has been split up into separate daemons, which
means we'll need to invoke those separately.

See https://git.gnome.org/browse/gnome-session/commit?id=18b6e567e1a
for the corresponding change to the regular session file.

https://bugzilla.gnome.org/show_bug.cgi?id=778309