Default URL scheme ssh:// and port not parsed correctly

[neben]

Steps to reproduce:

# ./client --foreground -d example.com:3232
2024/02/21 13:40:13 url scheme  example.com not recognised falling back to ssh:  :22 as no port specified
2024/02/21 13:40:13 Connecting to  example.com:3232
2024/02/21 13:40:13 Unable to start a new client connection: ssh: handshake failed: ssh: invalid packet length, packet too large

[NHAS]

Ah yep, thats a regression

[NHAS]

This now exists on the main branch