matroskadec: export codec bits_per_coded_sample

Fixes -codec copy with TTA from matroska to matroska.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavformat/matroskadec.c

@@ -1788,6 +1788,7 @@ static int matroska_read_header(AVFormatContext *s)
             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
             st->codec->sample_rate = track->audio.out_samplerate;
             st->codec->channels = track->audio.channels;
+            st->codec->bits_per_coded_sample = track->audio.bitdepth;
             if (st->codec->codec_id != AV_CODEC_ID_AAC)
             st->need_parsing = AVSTREAM_PARSE_HEADERS;
         } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {