Revert "New icons for PowerToys screen ruler"

[alvinashcraft]

Reverts #4890. Changes not available until the next PT release.

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[learn-build-service-prod]

Learn Build status updates of commit fb6cc4d:

✅ Validation status: passed

File	Status	Preview URL	Details
hub/images/pt-screen-ruler.png	✅Succeeded
hub/powertoys/screen-ruler.md	✅Succeeded

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PRMerger Results

Issue	Description
Image File	This PR added or updated an image file(s).