[ruby/net-http] Switch invalid server name format

invalid_servername is not a valid name in an SSL request due to
the use of the underscore, and LibreSSL 3.2.0 will raise an
exception for this.  These tests are not testing the allowed
characters in the server name, but how net/http handles cases where
the server name provided does not match the IP address you are
trying to connect to, so I think it's better to just modify the
tests to use a correct format.

While here, fix a typo in a test name, and use better code in the
ensure block so the same test doesn't issue both a failure and an
error.

https://github.com/ruby/net-http/commit/0e8dc91120

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