WebUI allows to enable "Periodically sync hardware" for Windows

[webteam-app]

Bug originally filed by nobuto at https://bugs.launchpad.net/bugs/1993093

maas: 1:3.2.6-12016-g.19812b4da-0ubuntu1~20.04.1

https://maas.io/docs/about-customising-machines#heading--about-customising-deployed-machines
https://maas.io/docs/how-to-customise-machines#heading--how-to-enable-hardware-sync-on-a-machine

The hardware sync function relies on a systemd timer according to the vendor data code so it's not applicable to Windows:
https://git.launchpad.net/maas/tree/src/metadataserver/vendor_data.py?id=95c09efafc46cfd755f90bc51ab76965afe4c1c8

However, WebUI doesn't gray out the option when provisioning an Windows image although VM host provisioning option is appropriately grayed out. Please see the screenshot attached.