[whatwg/streams] Remove unused parameter (#1125)

``WritableStreamFinishErroring`` is only invoked with one parameter, but it has signature with two parameters, the second one seems unused. It seems ``reason`` was added by mistake due to similarly named ``WritableStreamStartErroring``, while it actually should exists only as an argument to ``Upon promise rejection`` step.

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1125

-- Commit Summary --

  * Remove unused parameter

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/1125.patch
https://github.com/whatwg/streams/pull/1125.diff

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