avformat/riff: Declare VCR2 to be MPEG-2

This brings it in line with mpeg12dec.c.
(This entry has been added before the MPEG2VIDEO codec id
existed.)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/riff.c

@@ -161,7 +161,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('M', 'P', 'E', 'G') },
     { AV_CODEC_ID_MPEG1VIDEO,   MKTAG('P', 'I', 'M', '1') },
     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('P', 'I', 'M', '2') },
-    { AV_CODEC_ID_MPEG1VIDEO,   MKTAG('V', 'C', 'R', '2') },
+    { AV_CODEC_ID_MPEG2VIDEO,   MKTAG('V', 'C', 'R', '2') },
     { AV_CODEC_ID_MPEG1VIDEO,   MKTAG( 1 ,  0 ,  0 ,  16) },
     { AV_CODEC_ID_MPEG2VIDEO,   MKTAG( 2 ,  0 ,  0 ,  16) },
     { AV_CODEC_ID_MPEG4,        MKTAG( 4 ,  0 ,  0 ,  16) },