Fix intermittent failure in request_aggregator.two test where the sta…

…t counters would be a multiple of what's expected, indicating multiple requests were received.

nano/core_test/request_aggregator.cpp

@@ -137,6 +137,7 @@ TEST (request_aggregator, two)
 	nano::test::system system;
 	nano::node_config node_config = system.default_config ();
 	node_config.frontiers_confirmation = nano::frontiers_confirmation_mode::disabled;
+	node_config.active_elections.size = 0;
 	auto & node (*system.add_node (node_config));
 	system.wallet (0)->insert_adhoc (nano::dev::genesis_key.prv);
 	nano::keypair key1;