Add preseeding for atftpd so that it's started standalone

In theory, this change is not really needed here because the
package is not installed by d-i, it's already installed by live-build
in the live image. But I want this file to be consistent with the
version in debian-installer...

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

@@ -56,3 +56,4 @@ kismet-capture-common kismet-capture-common/install-users string
 kismet-capture-common kismet-capture-common/install-setuid boolean true
 wireshark-common wireshark-common/install-setuid boolean false
 sslh sslh/inetd_or_standalone select standalone
+atftpd atftpd/use_inetd boolean false