[whatwg/streams] Fix closed getter (fixes #912) (#914)

Took some inspiration from the writer’s `closed` getter :)
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/914

-- Commit Summary --

  * Fix closed getter (fixes #912)

-- File Changes --

    M index.bs (8)

-- Patch Links --

https://github.com/whatwg/streams/pull/914.patch
https://github.com/whatwg/streams/pull/914.diff

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https://github.com/whatwg/streams/pull/914