avformat/dashenc: Format VP9 bitdepth as decimal instead of Hexadecimal

For example bitdepth should be printed as 10 instead of 0A. Thanks to Hendrik Leppkes for pointing this out
Signed-off-by: James Almer <jamrial@gmail.com>

libavformat/dashenc.c

@@ -211,7 +211,7 @@ static void set_vp9_codec_str(AVFormatContext *s, AVCodecParameters *par,
     VPCC vpcc;
     int ret = ff_isom_get_vpcc_features(s, par, frame_rate, &vpcc);
     if (ret == 0) {
-        av_strlcatf(str, size, "vp09.%02x.%02d.%02x",
+        av_strlcatf(str, size, "vp09.%02x.%02d.%02d",
                     vpcc.profile, vpcc.level, vpcc.bitdepth);
     } else {
         // Default to just vp9 in case of error while finding out profile or level