Revert "Deepcopy the HMAC factory function's resulting function."
Revert "Deepcopy the HMAC factory function's resulting function."

This reverts commit a49ee2a0872b474e11a5f8dd9c169b2fac1ae22e.

Signed-off-by: Isis Lovecruft <830ecb0551a2e1179e1b0a4d09890973273772f4@torproject.org>

mmaker/bridgedb,wfn/bridgedb,pagea/bridgedb,mmaker/bridgedb,wfn/bridgedb,pagea/bridgedb