[whatwg/fetch] CORS preflights need a service-workers mode of "none" (#598)

Fixes #558.

This probably does not matter as it's never going to be same-origin, but better safe than sorry.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/598

-- Commit Summary --

  * CORS preflights need a service-workers mode of "none"

-- File Changes --

    M fetch.bs (1)

-- Patch Links --

https://github.com/whatwg/fetch/pull/598.patch
https://github.com/whatwg/fetch/pull/598.diff

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