Fix typo in ReactSuspenseList-test.internal.js

[ganapativs]

Fix typo in the test.

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[sizebot]

No significant bundle size changes to report.

Generated by 🚫 dangerJS against 44dc960

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[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contribution.