fix: Continue traversing a non-self-closing element's children

Fixes an issue where a non-self-closing element would have their children skipped when running the svelte-migrate self-closing-tags migration script.

for example:

<div>
<!-- 👇 doesn't get fixed by the migration script -->
    <i /> 
</div>

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sveltejs / kit

fix: Continue traversing a non-self-closing element's children #12175

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

Tests

Changesets

Edits

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