[whatwg/streams] Remove extra arguments left over from forAuthorCode refactor (#998)

In #984, I forgot two places where a (now non-existent) `forAuthorCode` argument was passed. Remove them.

No functional changes.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/998

-- Commit Summary --

  * Remove extra arguments left over from forAuthorCode refactor

-- File Changes --

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

-- Patch Links --

https://github.com/whatwg/streams/pull/998.patch
https://github.com/whatwg/streams/pull/998.diff

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