fix pacman config warning by commenting out correct config entries (#135

)

docker/add-aur.sh

@@ -9,8 +9,7 @@ set -o xtrace
 AUR_USER="${1:-ab}"
 
 # Enable the multilib repository
-sed -i '/#\[multilib\]/s/^#//' /etc/pacman.conf
-sed -i '/#Include = \/etc\/pacman.d\/mirrorlist/s/^#//' /etc/pacman.conf
+sed -i '/#\[multilib\]/,+1 s/^#//' /etc/pacman.conf
 
 # we're gonna need sudo to use the helper properly
 pacman -Sy --noconfirm