[Bug 769962] videocompositor: Remove output format alpha check

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=769962

--- Comment #4 from kevin <kevinbing.song at gmail.com> ---
So, how about to move output alpha check into
gst_video_aggregator_src_setcaps(). And change
gst_video_aggregator_src_setcaps() to one virtual function?

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