[whatwg/streams] Include server-worker include in pipe-through test (#642)

pipe-through.https.html uses worker_test() and therefore needs the /service-workers/service-worker/resources/test-helpers.sub.js script included. Add it.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/642

-- Commit Summary --

  * Include server-worker include in pipe-through test

-- File Changes --

    M reference-implementation/to-upstream-wpts/piping/pipe-through.https.html (1)

-- Patch Links --

https://github.com/whatwg/streams/pull/642.patch
https://github.com/whatwg/streams/pull/642.diff

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