[BUG] Lightning nodes are forgotten when the app is restarted

[porcupine1178]

No matter which Lightning nodes I add or remove, every time the app is restarted they are reverted back to the default ones.

[hsjoberg]

Hmm. I think we could add a checkbox to persistently sync with an LN node.
https://lightning.engineering/api-docs/api/lnd/lightning/connect-peer/#lnrpcconnectpeerrequest (perm).