Generic freedns match

src/freedombone-utils-interactive

     while [ ! $SITE_DETAILS_COMPLETE ]
     do
         data=$(mktemp 2>/dev/null)
-        if [[ $DDNS_PROVIDER == "freedns" ]]; then
+        if [[ $DDNS_PROVIDER == *"freedns"* ]]; then
             dialog --backtitle "$SITE_BACKTITLE" \
                    --title "$SITE_CONFIG_TITLE" \
                    --form "$SITE_FORM_TEXT" 14 55 3 \