audacious: don't DEFAULT_ENABLE dbus option.

1) There is no much gain in it. It might only be interesting to those
who want to use things like http://www.emacswiki.org/emacs/MPRIS or
https://extensions.gnome.org/extension/54/mpris-player-control/
(note azdyb/gnome-shell-extension-mpriscontrol#3)
2) In the present state to make sense it must be DEFAULT_ENABLEd for
audacious-plugins as well because the mpris functionality is split in
2 parts: one part is in audacious core doing bindings to controls and
the other part is in plugin that registers the interface in dbus and
listens.

packages/media-sound/audacious/audacious.exlib

@@ -27,6 +27,5 @@ DEPENDENCIES="
         media-sound/audacious-plugins[=${PV}]
 "
 
-DEFAULT_SRC_CONFIGURE_OPTION_ENABLES=( dbus )
 DEFAULT_SRC_CONFIGURE_PARAMS=( "--with-buildstamp=Exherbo" )