[w3c/webcomponents] Make Slot.assingedNodes({flatten: true}) return null if the slot is in a document tree (#482)

Given that a flat tree now includes a slot, and a slot is `display: contents` by default,
I think we no longer need to support "get distributed nodes" algorithm for a slot in a document tree.

Until now, "get distributed nodes" is required for a slot in a document tree because we have to construct the flat tree correctly, in case when the slot has a child node. Such child nodes are known as "fallback contents".

I am going to make Slot.getAssignedNodes({flatten: true}) return an empty array if the slot is in a document tree. It would make sense, I think.

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