[Bug 783000] tests: videoscale: Fix build warning error

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783000

--- Comment #5 from Seungha Yang <sh.yang at lge.com> ---
It's clear that VSCALE_TEST_GROUP is defined for videoscale-{1 ~ 6} but not for
*videoscale*

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