No more debootstrap symlinking

This was a hack which we don't need anymore.
(PureOS has its own script for green now)

helper/make_chroot.sh

@@ -1,12 +1,8 @@
 #!/bin/sh
 set -e
 
-ln -sf /usr/share/debootstrap/scripts/testing /usr/share/debootstrap/scripts/green
-
 debootstrap \
 	--keyring=/usr/share/keyrings/pureos-archive-keyring.gpg \
 	green \
 	lbchroot \
 	http://repo.puri.sm/pureos
-
-chroot lbchroot 'ln -s /usr/share/debootstrap/scripts/testing /usr/share/debootstrap/scripts/green'