lib-http: client: Respect the connection idle timeout, even when all …

…queues have unlinked from a peer.

Otherwise, the DNS TTL timeout dictates the connection idle timeout in some situations.

src/lib-http/http-client-peer.c

@@ -735,7 +735,7 @@ void http_client_peer_unlink_queue(struct http_client_peer *peer,
 				queue->name, array_count(&peer->queues));
 
 			if (array_count(&peer->queues) == 0)
-				http_client_peer_drop(&peer);
+				http_client_peer_check_idle(peer);
 			return;
 		}
 	}