[Bug 762736] compositor: revert 754465

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762736

--- Comment #1 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
The problem is that, by not filtering alpha formats in getcaps, compositor will
report to upstream that it can support alpha formats when it can't.

Imagine a scenario where upstream elements are able to provide both alpha and
non-alpha formats and compositor claims to accept both while it will ultimately
fail if it receives alpha. In this scenario the getcaps function will let
upstream select alpha or non-alpha when, in truth, only non-alpha should be
possible.

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