deflogin: set LIVECD_SESSION=DEFAULT_SESSION in livecd-user.conf

features.in/deflogin/live/image-scripts.d/50-livecd-user

 #!/bin/sh -efu
 # setup settings for live user
 
-[ -f /etc/sysconfig/livecd-user.conf ] || exit 0
+livecd_user_conf=/etc/sysconfig/livecd-user.conf
+
+[ -f "$livecd_user_conf" ] || exit 0
 
 cat > /etc/sysconfig/livecd-user.conf << EOF
 LIVECD_LOGIN="${GLOBAL_LIVE_USER:-}"
@@ -9,3 +11,6 @@ LIVECD_GROUPS="${GLOBAL_GROUPS:-}"
 LIVECD_ADMIN=1
 LIVECD_SUDO=1
 EOF
+
+[ -z "${GLOBAL_DEFAULT_SESSION:-}" ] ||
+    echo "LIVECD_SESSION=$GLOBAL_DEFAULT_SESSION" >> "$livecd_user_conf"