Nest: Report preferred counters also when 'import keep filtered' is enabled

  struct proto_stats *s = &c->stats;

  if (c->in_keep_filtered)

    cli_msg(-1006, "    Routes:         %u imported, %u filtered, %u exported",

	    s->imp_routes, s->filt_routes, s->exp_routes);

    cli_msg(-1006, "    Routes:         %u imported, %u filtered, %u exported, %u preferred",

	    s->imp_routes, s->filt_routes, s->exp_routes, s->pref_routes);

  else

    cli_msg(-1006, "    Routes:         %u imported, %u exported, %u preferred",

	    s->imp_routes, s->exp_routes, s->pref_routes);