Use the inputs when testing URI conversions in Http4sConversionSpec

[bpholt]

Not a huge deal, but I discovered that Http4sConversionSpec#http4sToSmithyAndBackUriTest wasn't using its input in its test setup, so most of the tests were redundant. I believe this was the intended test behavior.

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[CLAassistant]

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[bpholt]

Without the leading //, http4s parses this as the URI path, so the test fails because it was essentially trying to compare http://localhost/example.com to http://example.com.

[kubukoz]

i've had the "pleasure" of hitting this... yeah it's fun

[kubukoz]

pretty sure the CLA isn't needed for a change like this