Switch back installer to live one

The netinst installer is causing too many issues for unexperienced
users that are installing without enabling the network. They are ending
up in a console and are stuck there. See https://bugs.kali.org/view.php?id=6053
and the many duplicates.

The live installer is not offering close control on what metapackage
gets installed but at least you are sure to have a usable system at the
end.

auto/config

@@ -72,10 +72,10 @@ fi
 # Define options that vary across architectures
 case "$arch" in
     amd64)
-	lb_opts="$lb_opts --debian-installer cdrom"
+	lb_opts="$lb_opts --debian-installer live"
     ;;
     i386)
-	lb_opts="$lb_opts --debian-installer cdrom --linux-flavours 686-pae"
+	lb_opts="$lb_opts --debian-installer live --linux-flavours 686-pae"
     ;;
     armel|armhf)
 	lb_opts="$lb_opts --binary-images hdd --binary-filesystem ext4 --chroot-filesystem none"