Don't close shared dbus connection

[andrewheberle]

This PR would close #73

[gen2brain]

@ossenthusiast Such a function would make no sense on other platforms, though. The question is: what exactly does the systray package do, and what would the correct behaviour be? Not closing should be done only if it uses some global connection that it can reuse, if that is an option at all. I do not have time to explore all this currently.

[andrewheberle]

Based on the documentation of the dbus package used Close() should never be called on a shared *dbus.Conn:

https://pkg.go.dev/github.com/godbus/dbus#Conn.Close

[gen2brain]

Yeah, that makes sense. Why else would it be named "shared", all clear now, I think I already read that once and I forgot.