Install dconf gsettings backend by default
    
    This adds 'Recommends: dconf' so that we get a reasonable gsettings
    backend installed by default, as requested by the KDE spin. gtk+ uses
    gsettings for storing filechooser settings and the default 'memory'
    gsettings backend is not great when the user wants to alter the
    filechooser prefs.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1351236