[Bug 790836] examples: audiomixmatrix: Remove unused part

[GStreamer (GNOME Bugzilla)]

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

--- Comment #1 from Wonchul Lee <hi at wonchul.kr> ---
Created attachment 364404
  --> https://bugzilla.gnome.org/attachment.cgi?id=364404&action=edit
remove unused part of audiomixmatrix example

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