[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 #4 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Sebastian Dröge (slomo) from comment #3)
> Couldn't that still be 0? Instead of that, maybe it should be set to a very
> small value if it is 0?

If Use mediump, the 0 area will be very large on some platform, e.g my i.mx6Q.
But use highp, these area is very small too see.

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