Temporarily disable building wslsettings.exe by default

[OneBlue]

Summary of the Pull Request

This change disables building wslsettings.exe by default. This is a temporary change that will the build errors related to nuget packages failing to restore.

PR Checklist

• [ ] Closes: Link to issue #xxx
• [ ] Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• [ ] Tests: Added/updated if needed and all pass
• [ ] Localization: All end user facing strings can be localized
• [ ] Dev docs: Added/updated if needed
• [ ] Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Wslsettings.exe can still be built by passing -DWSL_BUILD_WSL_SETTINGS=true

Validation Steps Performed