fix(ui/core): rerender direct host child with right slot attr when root is switched

[tlouisse]

  // Assume we had: { template: myBool ? html`<div id=a></div>` : html`<span id=b></span>`, renderAsDirectHostChild: true }
  // If myBool started as true, <div id=a></div> would be rendered in first render above, A slot would be applied...
  // However, when myBool changes to false, the <span id=b></span> would be rendered instead...
  // We need to make sure that this "replaced root" gets the slot applied as well

[changeset-bot]

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Latest commit: ba4aa60

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

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@lion/ui	Patch

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