[whatwg/streams] Change async test to a promise_test (#523)

The test 'ws.getWriter() on an errored WritableStream' was using the
test() function. However, since it is an asynchronous test it needs to
use the promise_test() function. Fix it.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/523

-- Commit Summary --

  * Change async test to a promise_test

-- File Changes --

    M reference-implementation/to-upstream-wpts/writable-streams/general.js (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/523.patch
https://github.com/whatwg/streams/pull/523.diff

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