avformat/frmdec: Simplify finding pixel format

The fourccs used by the Megalux Frame format to determine the pixel
format are actually no fourccs at all as they are a single byte.
Furthermore, their range is continuous (1-5), so they are actually
ordinary indices. So treat them as such and don't use PixelFormatTags
for them.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

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