Fix crash when passing array children to preact-iso

[marvinhagemeister]

The following snippet lead to a crash:

<Router>
  <Route path="/" />
  {["a", "b"].map(x => <Route path={`/${x}`} />}
  {condition && <Route path="/boof" />}
</Route>

The error was caused because we didn't normalize children at all.

[changeset-bot]

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Latest commit: c7ca0a4

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

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Name	Type
preact-iso	Patch

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