[whatwg/fetch] Add Accept: */* to CORS-preflight requests' headers (#941)

Tests: web-platform-tests/wpt#18739.

Closes: #922.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/941

-- Commit Summary --

  * Add Accept: */* to CORS-preflight requests' headers

-- File Changes --

    M fetch.bs (3)

-- Patch Links --

https://github.com/whatwg/fetch/pull/941.patch
https://github.com/whatwg/fetch/pull/941.diff

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