fftools/ffmpeg_opt: update program description to match manpage

Cf. 2244722f1f

fftools/ffmpeg_opt.c

@@ -1254,7 +1254,7 @@ void show_help_default(const char *opt, const char *arg)
 
 void show_usage(void)
 {
-    av_log(NULL, AV_LOG_INFO, "Hyper fast Audio and Video encoder\n");
+    av_log(NULL, AV_LOG_INFO, "Universal media converter\n");
     av_log(NULL, AV_LOG_INFO, "usage: %s [options] [[infile options] -i infile]... {[outfile options] outfile}...\n", program_name);
     av_log(NULL, AV_LOG_INFO, "\n");
 }