Unable to connect via the default port

Created by: h4nsu

cargo-contract uses url library to parse the command line argument to url::Url and then converts it back to String while passing to subxt::ClientBuilder.

The whole url lib operates under the assumption that if the default port for a particular protocol is used, it is represented as None variant. For some reason it doesn't care to include that default port when converting Url to String: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=59e7111b1aa5c5542e1127c1f13b88ec

So that whole String -> Url -> String conversion results in the port value being lost in case the default port was used. subxt::ClientBuilder rejects to use an address without a port.