[whatwg/streams] Small fix to new WritableStreamDefaultWriter() (#561)

The algorithm for the WritableStreamDefaultWriter constructor made
reference to a _writer_ variable that was not defined. Use *this*
instead.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/561

-- Commit Summary --

  * Small fix to new WritableStreamDefaultWriter()

-- File Changes --

    M index.bs (10)

-- Patch Links --

https://github.com/whatwg/streams/pull/561.patch
https://github.com/whatwg/streams/pull/561.diff

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