[FancyZones] Fixed monitor id for unified work areas

[SeraphimaZykova]

Summary of the Pull Request

What is this about:

Fixed monitor id when using a single layout on all monitors.

What is include in the PR:

How does someone test / validate:

• Turn on Allow zones to span across monitors
• Change layout
• Verify that layout was changed
• Add a virtual desktop
• Change layout on another VD
• Verify that both layouts are different and set correctly

Quality Checklist

• Linked issue: #xxx
• Communication: I've discussed this with core contributors in the issue.
• Tests: Added/updated and all pass
• Installer: Added/updated and all pass
• Localization: All end user facing strings can be localized
• Docs: Added/ updated
• Binaries: Any new files are added to WXS / YML
  • No new binaries
  • YML for signing for new binaries
  • WXS for installer for new binaries

Contributor License Agreement (CLA)

A CLA must be signed. If not, go over here and sign the CLA.