Revert "http: Reset curl TLS options between transfers"

This reverts commit 420ce91428.

Apparently we do depend on the session-set certificates in some
situations. We should fix that, but until someone puts in the effort to
do so, reverting this will at least unbreak things.

(cherry picked from commit e61ae2114c)
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Internal Server Error - Gitea: Git with a cup of tea
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