fixing DEBCONF error when upgrading from 1.0 to 3.x : it migrates automatically to /var/www without telling / asking the user

debian/alternc.config

@@ -135,6 +135,8 @@ while [ "$QUEST_STATE" != 0 -a "$QUEST_STATE" != 14 ]; do
     if [ "x$ALTERNC_LOC" != "x" ]; then
       ALTERNC_HTML="$ALTERNC_LOC/html"
       ALTERNC_MAIL="$ALTERNC_LOC/mail"
+      db_set alternc/alternc_html "$ALTERNC_HTML"
+      db_set alternc/alternc_mail "$ALTERNC_MAIL"
     fi
 
     # We ask for the hosting name and the FQDN