avformat/nutenc: Omit AV_PKT_DATA_QUALITY_STATS when storing side data.

This side data does not serve or improve decoding the data, it thus
would semantically be metadata and not side data.
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/nutenc.c

@@ -933,6 +933,7 @@ static int write_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int
                 break;
             case AV_PKT_DATA_METADATA_UPDATE:
             case AV_PKT_DATA_STRINGS_METADATA:
+            case AV_PKT_DATA_QUALITY_STATS:
                 // belongs into meta, not side data
                 break;
             }