add more volume data to SessionSetTrackVolumeData

id, _id and groupID added to the third parameter of this API call

web/app/assets/javascripts/react-components/helpers/MixerHelper.js.coffee

@@ -1005,6 +1005,9 @@ MIX_MODES = context.JK.MIX_MODES;
       _broadcast = broadcast
 
     mixer =  @getMixer(mixerId, mode)
+    context.trackVolumeObject.id = mixer.id
+    context.trackVolumeObject._id = mixer._id
+    context.trackVolumeObject.groupID = mixer.group_id
     context.trackVolumeObject.clientID = mixer.client_id
     context.trackVolumeObject.broadcast = _broadcast
     context.trackVolumeObject.master = mixer.master