[whatwg/streams] Writable stream spec fixes (#681)

Fixes a few spec bugs introduced in #655.

r? @tyoshino and @domenic.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/681

-- Commit Summary --

  * Fix slot reference in WritableStreamDefaultWriterWrite step 14
  * Small simplification in WritableStreamDefaultControllerError
  * Fix spec bug in WritableStreamDefaultControllerError

-- File Changes --

    M index.bs (6)
    M reference-implementation/lib/writable-stream.js (4)

-- Patch Links --

https://github.com/whatwg/streams/pull/681.patch
https://github.com/whatwg/streams/pull/681.diff

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