Move the jobs output cache into the formats code so that #() work more

generally (for example, again working in set-titles-string).

server.c

@@ -485,6 +485,8 @@ server_second_callback(unused int fd, unused short events, unused void *arg)
 
 	server_client_status_timer();
 
+	format_clean();
+
 	evtimer_del(&server_ev_second);
 	memset(&tv, 0, sizeof tv);
 	tv.tv_sec = 1;