fix: treat each blocks with async dependencies as uncontrolled

[Rich-Harris]

Oddly enough I can't seem to produce a failing test around this, but the following code...

<script lang="ts"> import Dummy from './Dummy.svelte';  const array = await [1, 2]; </script> <article>	{#each await array}	<div> <Dummy /> </div>	{/each} </article>

...will fail to hydrate, because of the is_controlled optimisation being incorrectly applied.

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[github-actions]

Playground

pnpm add https://pkg.pr.new/svelte@17077 

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