vo_gpu: yuv alpha is always full range

Probably. It's not like these pixel formats are formally specified -
FFmpeg added them because _some_ file format or decoder supports it, and
while that format/codec may define it precisely, the pixel format is
sort of disconnected and just a FFmpeg thing.

In any case, the yuva sample I had at hand uses the full range the
component data type can provide. The old code used the same "shifted"
range as for Y/U/V components, which must have been wrong.

This will not work correctly for packed YUVA formats, but fortunately
they matter even less.

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