fs/fshttp: fix TestCertificates leaking client cert/key onto global config

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This was fixed in this commit in an inelegant way

399bc6a6a6 fshttp: don't send --header values to other hosts on redirect

The current commit fixes it properly with AddConfig.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
(cherry picked from commit 1b4dea8dac)

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