Fix backend_template save after package change.

bin/v-change-user-package

@@ -82,6 +82,7 @@ change_user_package() {
 LNAME='$LNAME'
 PACKAGE='$package'
 WEB_TEMPLATE='$WEB_TEMPLATE'
+BACKEND_TEMPLATE='$BACKEND_TEMPLATE'
 PROXY_TEMPLATE='$PROXY_TEMPLATE'
 DNS_TEMPLATE='$DNS_TEMPLATE'
 WEB_DOMAINS='$WEB_DOMAINS'