[wpt][fetch-api] Don't persist cookie in cors-filtering.sub.any.js
... since only response headers are tested, not the Cookie request
header. This stops cookie pollution causing spurious failures in other
tests if the same browser is used (e.g., 0).
Also, remove some Test.done()s that aren't necessary for
promise_test()s.
Bug: None
Change-Id: Ie75af268052f32acf96c00c9b3948a5ee4cf3019
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5838015
Reviewed-by: Adam Rice ricea@chromium.org
Commit-Queue: Jonathan Lee jonathanjlee@google.com
Cr-Commit-Position: refs/heads/main@{#1352807}