Added downmix trough gstreamer for all boxes

 All boxes who do have /proc/audio/ac3 entry
 and that field does contain downmix when downmix has been selected to on in e2,
 will now play dts downmixed by gstreamer.
 Note the plugin :
 gstreamer1.0-plugins-bad-dtsdec needs to be installed
 on stb :
 opkg install gstreamer1.0-plugins-bad-dtsdec

	modified:   gstdvbaudiosink.c

Author: christophecvr

gstdvbaudiosink.c

@@ -439,7 +439,10 @@ static GstCaps *gst_dvbaudiosink_get_caps(GstBaseSink *basesink, GstCaps *filter
 	);
 
 #if defined(HAVE_DTS) && !defined(HAVE_DTSDOWNMIX)
+	if (!get_downmix_setting())
+	{
 	gst_caps_append(caps, gst_caps_from_string(DTSCAPS));
+	}
 #endif
 
 #ifdef HAVE_DTSDOWNMIX