Custom servers and validation needs non-secure option

[Duckmanjbr]

Description

As of the latest app release there is no option for non-secure connections to a self-hosted Electrum server. This is a problem due to the fact that some Electrum servers don't offer the option to set TLS/SSL. Umbrel is a good example for this issue. Only non-secure connections are allowed on port 50001 to the Umbrel Electrum server. Tor is a working option but that requires external network flow and therefor has slower response.

Version

2.0.2

Steps to reproduce

Set Electrum server to non-secure connection. Add custom Electrum server into Green's "Custom servers and validation" setting.

Expected behaviour

Green app should connect to Electrum server.

Actual behaviour

Green app does not connect to Electrum server.

Screenshots

Device or machine

Additional info

Follow on to: Blockstream/gdk#161