fix: make tutorial consistent with blog-tutorial-demo (Typescript errors)

[ArmandPhilippot]

Description (required)

Fixes two more Typescript errors in the unit 6 of the tutorial. (see withastro/blog-tutorial-demo#33)

Related issues & labels (optional)

• Suggested label: code snippet update

[astrobot-houston]

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en/tutorial/6-islands/2.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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[sarah11918]

You're too good to me, Armand! Going to rerun the Netlify deploy, but I can't thank you enough for your help this weekend at crunch time! 💪

[sarah11918]

Redeploy on Netlify worked!