Do not remove track informations in DelStream for non http ASF muxing.

It fixes #3522.

modules/mux/asf.c

@@ -662,6 +662,7 @@ static int DelStream( sout_mux_t *p_mux, sout_input_t *p_input )
         }
     }
 
+    if( p_sys->b_asf_http )
         vlc_array_remove( p_sys->p_tracks, vlc_array_index_of_item( p_sys->p_tracks, (void *)tk ) );