avformat/sccdec: Remove redundant check

The av_sscanf() will filter lines like "Scenarist_SCC V1.0" out.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/sccdec.c

@@ -88,8 +88,6 @@ static int scc_read_header(AVFormatContext *s)
                 break;
             continue;
         }
-                if (!strncmp(line, "Scenarist_SCC V1.0", 18))
-                    continue;
         if (av_sscanf(line, "%d:%d:%d%*[:;]%d", &hh, &mm, &ss, &fs) != 4)
             continue;