MPD.java: Don't send close command on disconnect.
MPD.java: Don't send close command on disconnect.

The way we disconnect, the command and the actual hard disconnection race. It
has to be one or the other, unless we're going to join the close command.

joansmith/dmix,joansmith/dmix,hurzl/dmix,hurzl/dmix,0359xiaodong/dmix,0359xiaodong/dmix,jcnoir/dmix,abarisain/dmix,abarisain/dmix,jcnoir/dmix