[whatwg/fetch] Set CORS preflight requests' `mode` to `cors`. (#916)

CORS preflight requests' `mode` is now exposed via the `Sec-Fetch-Mode` header, and it
makes sense to set it to `cors`, as it's part of the CORS protocol.

Fixes https://github.com/w3c/webappsec-fetch-metadata/issues/35.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/916

-- Commit Summary --

  * Set CORS preflight requests' `mode` to `cors`.

-- File Changes --

    M fetch.bs (1)

-- Patch Links --

https://github.com/whatwg/fetch/pull/916.patch
https://github.com/whatwg/fetch/pull/916.diff

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