Fix typo in codegen code

[emilk]

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[github-actions]

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Result	Commit	Link	Manifest
✅	a067b04	https://rerun.io/viewer/pr/12493	+nightly +main

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[grtlr]

@copilot Run pixi run codegen and commit the changes.

[Copilot]

@grtlr I've opened a new pull request, #12563, to work on those changes. Once the pull request is ready, I'll request review from you.