fix: use package id instead of display name in winget dsc example

[scottmckendry]

I tried to use the example in the doc but got this error:

I realised this is due to the DSC file calling for an ID and the example uses the package's display name instead. I found the correct ID with winget search powertoys:

Replaced it in the example and it works as expected.

[prmerger-automator]

@scottmckendry : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 77715a7:

✅ Validation status: passed

File	Status	Preview URL	Details
hub/powertoys/dsc-configure.md	✅Succeeded

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