Revert "h264: Properly set coded_{width, height} when parsing H.264."

This reverts commit b47904d1.

coded_{width, height} overwrites width and height in avcodec_open and
it currently just report the non-lowres size.

libavcodec/h264.c

@@ -2574,9 +2574,6 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
         s->avctx->sample_aspect_ratio= h->sps.sar;
         av_assert0(s->avctx->sample_aspect_ratio.den);
 
-        h->s.avctx->coded_width = 16*s->mb_width;
-        h->s.avctx->coded_height = 16*s->mb_height;
-
         if(h->sps.video_signal_type_present_flag){
             s->avctx->color_range = h->sps.full_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
             if(h->sps.colour_description_present_flag){