[Bug 767635] gleffects: fix little rectangel appears at the center when use squeeze and tunnel effects

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767635

--- Comment #1 from Haihua Hu <jared.hu at nxp.com> ---
Created attachment 329755
  --> https://bugzilla.gnome.org/attachment.cgi?id=329755&action=edit
fix squeeze and tunnel effects shader issue

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