fix: example immutable missing on:click

[fritx]

Svelte 5 rewrite

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Fix on:click been accidentally removed (via #8836) from the official example:
https://svelte.dev/examples/immutable-data

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[dummdidumm]

Thank you! Could you do the same change against the svelte-4 branch, too? That's the one that's currently deploying the svelte.dev site.