lavf: don't set AVCodecContext.has_b_frames in compute_pkt_fields().
It is not supposed to be done outside lavc. This is basically a revert of 818062f2. It is unclear what issue this was supposed to fix, if it reappears again it will have to be fixed in a more proper place. The wtv-demux test change is because the sample starts with a B-frame.
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