Auto merge of #23963 - asajeffrey:magicleap-grainier, r=Manishearth

Reduce magicleap servo screen resolution

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Reduce the magicleap resolution from 720p to 480p. (Videos at 720p seem to lag.)

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes do not require tests because we don't test native UI

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