[Bug 769962] videocompositor: Remove output format alpha check

[GStreamer (GNOME Bugzilla)]

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

--- Comment #2 from kevin <kevinbing.song at gmail.com> ---
We write one plugin based on videoaggregator for our hardware. The hardware has
the capability to do video blending. The input has alpha channel and the output
hasn't alpha channel. And we need the plugin output video format without alpha.
But above code will report error. And plugin can't overwrite the function which
report error.

Can changed to just print warning for loss of information?

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