qa: remove openssl comparison from wallet test
qa: remove openssl comparison from wallet test

Removes OldSetKeyFromPassphrase/OldEncrypt/OldDecrypt, because the
test relies on OpenSSL to work consistently. Between versions
1.1 and 3.0 of OpenSSL, a regression in the decryption results
exists.

Since the code is only there to ensure the "new" (now 6 years old)
encryption code works the same as OpenSSL, this can be removed,
especially since currently we do not support any wallet version
that uses OpenSSL for wallet encryption and decryption.

Cherry-picked from: a897d0e3

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