build: Fix Codespaces prebuilds with missing comma

[JasonEtco]

Description of Change

This PR adds one comma to fix the errors that cropped up in Codespaces Prebuilds, due to some errant copy-pasta from #37765.

cc @MarshallOfSound

Checklist

• PR description included and stakeholders cc'd
• npm test passes

Release Notes

Notes: none

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[erickzhao]

lgtm

[MarshallOfSound]

lgtm

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[release-clerk]

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