yubikeytoken: fix failing test after signature got fixed
yubikeytoken: fix failing test after signature got fixed

jalr/privacyidea,jh23453/privacyidea,jh23453/privacyidea,jh23453/privacyidea,jh23453/privacyidea,wheldom01/privacyidea,wheldom01/privacyidea,privacyidea/privacyidea,privacyidea/privacyidea,wheldom01/privacyidea,jalr/privacyidea,jalr/privacyidea,privacyidea/privacyidea,jh23453/privacyidea,privacyidea/privacyidea,jalr/privacyidea,privacyidea/privacyidea,jh23453/privacyidea,jalr/privacyidea,privacyidea/privacyidea,jalr/privacyidea,wheldom01/privacyidea,wheldom01/privacyidea,wheldom01/privacyidea