[whatwg/streams] Redundant step: "Assert: stream.[[state]] is "closing" or "error..." (#639)

https://streams.spec.whatwg.org/commit-snapshots/22b3f03bf803868bf65d9b57f862cc7e3cc80188#writable-stream-finish-close

> Assert:​ stream\.\[\[state\]\] is "closing" or "errored"\.

Looks the assert in the following else clause is enough.

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