[whatwg/dom] Restore deep cloning of shadow root contents. (PR #1480)

This restores the behaviour introduced by #1272.

After #1334, the shadow-root cloning step says to clone each child of the shadow root with `subtree` set to `subtree`. When the original call is `host.cloneNode(false)`, that causes each direct child of a clonable shadow root to be cloned shallowly.

That contradicts the behaviour agreed in #1249 / #1272 and the WPT `shadow-dom/shadow-root-clonable.html`, which expects a clonable shadow root to be cloned in its entirety even when the shadow host is shallow-cloned.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1480

-- Commit Summary --

  * Restore deep cloning of clonable shadow root contents.

-- File Changes --

    M dom.bs (2)

-- Patch Links --

https://github.com/whatwg/dom/pull/1480.patch
https://github.com/whatwg/dom/pull/1480.diff

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