fix(piv): Fix YubiKeySignatureGenerator.DigestData regression in Sample App#398

DennisDyallo merged 2 commits intodevelopYubico/Yubico.NET.SDK:developfrom

fix/issue-395-digest-data-regressionYubico/Yubico.NET.SDK:fix/issue-395-digest-data-regressionCopy head branch name to clipboard