[whatwg/streams] Update ReadableStreamTee to allow cloning for only the second branch (#528)

This is part of fixing https://github.com/yutakahirano/fetch-with-streams/issues/67.

/cc @youennf @yutakahirano. Because of how I changed this (just modifying the meaning of the second arg being true) this should require no subsequent changes to Fetch.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/528

-- Commit Summary --

  * Update ReadableStreamTee to allow cloning for only the second branch

-- File Changes --

    M index.bs (64)
    M reference-implementation/lib/readable-stream.js (23)

-- Patch Links --

https://github.com/whatwg/streams/pull/528.patch
https://github.com/whatwg/streams/pull/528.diff

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