[archiso] Remove workwaround for nls/vfat

The proper fix in now in mkinitcpio-18

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@gmail.com>
prepare release

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@gmail.com>
[configs/releng] Fix /root mode

Thanks Izumi Natsuka for reporting this.

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@gmail.com>