avformat/matroskaenc: Undo bits_per_coded_sample change as bits_per_raw_sample is available again

Reminded-by: James Almer
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/matroskaenc.c

@@ -910,8 +910,8 @@ static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
     }
 
     if (!bit_depth && par->codec_id != AV_CODEC_ID_ADPCM_G726) {
-        if (par->bits_per_coded_sample)
-            bit_depth = par->bits_per_coded_sample;
+        if (par->bits_per_raw_sample)
+            bit_depth = par->bits_per_raw_sample;
         else
             bit_depth = av_get_bytes_per_sample(par->format) << 3;
     }