[issue34938] Fix mimetype.init() to account for from import

[AWhetter]

Change by AWhetter <ashley at awhetter.co.uk>:


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keywords: +patch
pull_requests: +16158
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/16567

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34938>
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