^C doesn't respond when connecting to mqtt fails on startup

[prologic]

Noticed this in testing and trying to get the daemon/server up and running.

[maruel]

Thanks, yes the current state of the project is a bit sad; and the code tries to "nicely" handle Ctrl-C, but fails to. https://github.com/maruel/dlibox/blob/master/cmd/dlibox/main.go#L34