libavformat/electronicarts: also demux mpeg audio layer 2

Signed-off-by: Peter Ross <pross@xvid.org>

http://wiki.multimedia.cx/index.php?title=Electronic_Arts_SCxl
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/electronicarts.c

@@ -239,6 +239,7 @@ static int process_audio_header_elements(AVFormatContext *s)
                 return 0;
             }
             break;
+        case 15:
         case 16:
             ea->audio_codec = AV_CODEC_ID_MP3;
             break;