Remove the localhost conversion, since it prevents easy secure origin based feature tests

[fbuecklers]

Hi,

I like to understand why this localhost mapping exists. Actually, BrowserStack works quite well with forwarding localhost traffic. Actually, this "fix" will prevent to easily test webplatform secure features like service workers or crypto based functionalities.

https://github.com/modernweb-dev/web/blob/e210e4996fce284c553408b392314a009081ea52/packages/test-runner-browserstack/src/browserstackLauncher.ts#L46

Thanks in advance