configs/releng: move the mirror uncommenting sed command from customize_airootfs.sh to a pacman hook

nl6720requested to merge
nl6720/archiso:sed-mirrorlist into master

After pacman-mirrorlist is installed, /etc/pacman.d/hooks/uncomment-mirrors.hook will run a sed command which uncomments all Server lines in /etc/pacman.d/mirrorlist.

The result can be verified by looking at workdir/x86_64/airootfs/etc/pacman.d/mirrorlist or booting the ISO with systemd.mask=reflector.service.

This brings us another step closer to the complete removal of customize_airootfs.sh (#21 (closed)).

This was made possible because of #73 (closed).

Edited by nl6720

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