avfilter/vf_scdet: change threshold checking

Also allow score to match threshold thus allowing ==0.0 scores.

libavfilter/vf_scdet.c

@@ -163,7 +163,7 @@ static int activate(AVFilterContext *ctx)
         snprintf(buf, sizeof(buf), "%0.3f", s->scene_score);
         set_meta(s, frame, "lavfi.scd.score", buf);
 
-        if (s->scene_score > s->threshold) {
+        if (s->scene_score >= s->threshold) {
             av_log(s, AV_LOG_INFO, "lavfi.scd.score: %.3f, lavfi.scd.time: %s\n",
                     s->scene_score, av_ts2timestr(frame->pts, &inlink->time_base));
             set_meta(s, frame, "lavfi.scd.time",