Change the default domain name at the end

src/freedombone-utils-dns

@@ -426,6 +426,7 @@ function change_default_domain_name {
     email_change_default_domain_name "$NEW_DEFAULT_DOMAIN_NAME"
 
     sed -i "/${NEW_DEFAULT_DOMAIN_NAME}/d" "$CONFIGURATION_FILE"
+    write_config_param DEFAULT_DOMAIN_NAME "${NEW_DEFAULT_DOMAIN_NAME}"
 }
 
 # NOTE: deliberately no exit 0