tests/openssh: use upstream's algorithms in "no openssl" example

When I initially wrote this test, I wasn't aware that services.openssh
could opt into using OpenSSH's default algorithms by just setting the
relevant settings to null.

That's a better approach since:
* it's a simpler setting for this test to have to worry about
* it introduces test coverage for the null case
* the null case should be demonstrated as an example for those that
  want to compile without OpenSSL

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