[whatwg/streams] Verify that transformer start() is called as a method (#815)

The test "Transform stream should call transformer methods as methods" in
general.js was not verifying that start() is called as a method. Assert
that it is.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/815

-- Commit Summary --

  * Verify that transformer start() is called as a method

-- File Changes --

    M reference-implementation/to-upstream-wpts/transform-streams/general.js (3)

-- Patch Links --

https://github.com/whatwg/streams/pull/815.patch
https://github.com/whatwg/streams/pull/815.diff

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