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h265parser: Fix short_term_ref_pic_set() size calculation

Seungha Yang requested to merge seungha.yang/gstreamer:h265parse-struct-size into main

This field is used by DXVA/NVDEC/VA, and each specification describes (NVDEC is not well documented) that it's the number of bits used in short_term_ref_pic_set().

DXVA doesn't explicitly mention that whether the size of emulation preventation bytes (EPB) is inclusive or not, but VA is clearly specifying that it's the size after removing EPB. Excluding EPB size here makes more sense therefore.

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