Fix test if OpenSSL provider enabled.
Fix test if OpenSSL provider enabled.

OpenSSL hash object just reflects the arg vs Botan object which
calls it SHA-160. Avoid the confusion by using SHA-256 instead.

randombit/botan,webmaster128/botan,randombit/botan,randombit/botan,webmaster128/botan,randombit/botan,randombit/botan,webmaster128/botan,webmaster128/botan,webmaster128/botan