[whatwg/streams] Fix assertion when writing to a closed writable stream (PR #1342)

Closes #1341.

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- [x] At least two implementers are interested (and none opposed):
   * [Matches Chromium](https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/streams/writable_stream_default_controller.cc;l=388-393;drc=d5af351cc29e7258499bad863b8e70298de981d2)
   * [Matches Firefox](https://searchfox.org/mozilla-central/rev/7bf5ed3b5364da0bee109bdcac3ab8c96df5a972/dom/streams/WritableStreamDefaultController.cpp#535-536)
- [x] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * https://github.com/web-platform-tests/wpt/pull/51819
- [x] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: N/A
   * Gecko: N/A
   * WebKit: https://bugs.webkit.org/show_bug.cgi?id=283739
   * Deno: https://github.com/denoland/deno/issues/27102
   * Node.js: Fixed already by https://github.com/nodejs/node/pull/57280
- [x] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: N/A
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<a href="https://whatpr.org/streams/1342.html" title="Last updated on Apr 3, 2025, 6:36 AM UTC (2ee13d5)">Preview</a> | <a href="https://whatpr.org/streams/1342/4d90f7f...2ee13d5.html" title="Last updated on Apr 3, 2025, 6:36 AM UTC (2ee13d5)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1342

-- Commit Summary --

  * Fix assertion when writing to a closed writable stream

-- File Changes --

    M index.bs (4)
    M reference-implementation/lib/abstract-ops/writable-streams.js (2)
    M reference-implementation/web-platform-tests (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/1342.patch
https://github.com/whatwg/streams/pull/1342.diff

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