Don't wait for reconnect when user cancels auth
    
    When starting virt-viewer with the --reconnect switch to a guest that
    has a password, if the user cancels the authentication dialog (e.g.
    pressing 'Esc'), the window will display "Waiting for guest domain to
    restart".  Obviously, the domain will never restart because it's already
    running.
    
    After this fix, the application will simply exit when the user cancels
    authentication, even if the --reconnect switch is used.