[Bug 730509] facedetect: fix update on change

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=730509
  GStreamer | gst-plugins-bad | 1.x

--- Comment #2 from Nicola <lists at svrinformatica.it> 2014-05-30 19:28:15 UTC ---
on_change means that a bus message is sended when a face is detected and
another bus message is sended when no face is detected, no check is done on
position or on number of faces,

the description should be clear enough (face detected/not detected) however
english is not my native languange, what do you suggest?

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