[whatwg/streams] Remove redundant startPromise declaration (#1067)

Fixes #1065

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

  https://github.com/whatwg/streams/pull/1067


-- Commit Summary --

  * Remove redundant startPromise declaration

-- File Changes --

    M index.bs (1)

-- Patch Links --

https://github.com/whatwg/streams/pull/1067.patch

https://github.com/whatwg/streams/pull/1067.diff


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