Add other ddns variables

src/freedombone-ddns

@@ -34,6 +34,8 @@ export TEXTDOMAINDIR="/usr/share/locale"
 source "/usr/share/${PROJECT_NAME}/utils/${PROJECT_NAME}-utils-config"
 
 DDNS_PROVIDER="none"
+DDNS_USERNAME=
+DDNS_PASSWORD=
 
 function update_inadyn_config {
     if [ ! -f /etc/inadyn.conf ]; then