[whatwg/xhr] Do not reset override MIME type (#218)

It does not make much sense as overrideMimeType() isn't blocked from being used before open() is invoked. (And 3/4 of the major implementations do not have this behavior.)

Partially reverts 121cee50b6f51215f046266642964b4c53a02a7c.

Tests: https://github.com/web-platform-tests/wpt/pull/12404.

Closes https://github.com/web-platform-tests/wpt/issues/12289.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/218

-- Commit Summary --

  * Do not reset override MIME type

-- File Changes --

    M xhr.bs (4)

-- Patch Links --

https://github.com/whatwg/xhr/pull/218.patch
https://github.com/whatwg/xhr/pull/218.diff

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