Can't set port of seed node

[Cyrix126]

The screen of seed node will have a helper at the right indicating that you can set the port number if necessary, providing an unhelpful example without a port.

If I put an address with ur.onion:port and click on Connect button, I will get "Invalid V3 Onion Address".

The issue is that the validation of the input text is not taking into account that a port can be be entered.

haveno-app/lib/views/screens/seednode_setup_screen.dart

Line 29 in de0953a

final _onionRegex = RegExp(r'^[a-zA-Z2-7]{56}\.onion$');

haveno-app/lib/views/screens/seednode_setup_screen.dart

Line 220 in de0953a

if (!_onionRegex.hasMatch(value)) {