fix: Add WINDOWS to switch in Serilog HostBuilderExtensions

[frogcrush]

GitHub Issue (If applicable): closes #2491

PR Type

What kind of change does this PR introduce?

• Bugfix

What is the current behavior?

#2491

What is the new behavior?

#2491

PR Checklist

Please check if your PR fulfills the following requirements:

• [X] Tested code with current supported SDKs
• [ ] Docs have been added/updated which fit documentation template. (for bug fixes / features)
• [X] Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• [ ] Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• [X] Contains NO breaking changes
• [ ] Updated the Release Notes
• [X] Associated with an issue (GitHub or internal)

Other information

Shouldn't introduce any unwanted functionality as on WinUI and -desktop it should be able to write to the app data folder.