Drop security.kali.org from the apt-setup preseed

kali-config/common/includes.installer/preseed.cfg

@@ -1,12 +1,17 @@
+# This file replaces preseed.cfg embedded in the initrd by
+# debian-installer. It should be kept in sync except with the
+# mirror/{codename,suite} dropped so that the image installs
+# what's available on the CD instead of hardcoding a specific
+# release.
+
 # Default repository information (don't include codename data, d-i figures it
 # out from what's available in the ISO)
 d-i mirror/country string enter information manually
 d-i mirror/http/hostname string http.kali.org
 d-i mirror/http/directory string /kali
-d-i apt-setup/security_host string security.kali.org/kali-security
 
-# Disable volatile and backports
-d-i apt-setup/services-select multiselect security
+# Disable security, volatile and backports
+d-i apt-setup/services-select multiselect 
 
 # Enable contrib and non-free
 d-i apt-setup/non-free boolean true