[GUI] - Settings - Restart daemon with previous config in case of error

[jp1ac4]

When changing the connection values in Settings -> Node (for either node type), the GUI tries to restart the daemon with the updated values. If there's an error, the daemon will stop running and the user must re-save the previous values to make the daemon start running again.

We should try to restart the daemon with the previous values in this case and let the user know there was an error with the new values.