[whatwg/fetch] Remove "serviceworker" from RequestDestination (#603)

This value isn't something that should appear in the API.  It's for internal use only.

Fixes #602
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/603

-- Commit Summary --

  * Fixes #602

-- File Changes --

    M fetch.bs (2)

-- Patch Links --

https://github.com/whatwg/fetch/pull/603.patch
https://github.com/whatwg/fetch/pull/603.diff

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