fix: replace typo in compiler error messages

[Rich-Harris]

Spotted a typo in #14006 and realised that we have the same typo in user-facing stuff. This fixes it

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[changeset-bot]

🦋 Changeset detected

Latest commit: f2daae9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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svelte	Patch

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[pkg-pr-new]

pnpm add https://pkg.pr.new/svelte@14044

commit: f2daae9

[trueadm]

Typo change looks good, although you might need to update the tests too.

[dummdidumm]

Well I guess I both like to use that word and spell it wrong all the time 😄