ffmpeg: don't use resample_lavr_opts

That pointer isn't used by absolutely anything.
Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>

ffmpeg_filter.c

@@ -1020,7 +1020,6 @@ int configure_filtergraph(FilterGraph *fg)
         }
         if (strlen(args))
             args[strlen(args) - 1] = '\0';
-        fg->graph->resample_lavr_opts = av_strdup(args);
 
         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
         if (e)