[whatwg/fetch] Make CORS-preflight fetches set the CORS flag (#743)

Otherwise a 401 response would not necessarily result in rejection.

Fixes #741.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/743

-- Commit Summary --

  * Make CORS-preflight fetches set the CORS flag

-- File Changes --

    M fetch.bs (7)

-- Patch Links --

https://github.com/whatwg/fetch/pull/743.patch
https://github.com/whatwg/fetch/pull/743.diff

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