[Bug 790836] examples: audiomixmatrix: Remove unused part

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790836

Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> changed:

           What    |Removed                     |Added
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   Target Milestone|git master                  |1.13.1

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