Use the time-to-live argument in really-session-adjust-timeout!

scheme/httpd/surflets/surflet-handler.scm

@@ -335,8 +335,7 @@
 	 (new-memo (make-default-memo)))
     ;; Do it this way: new values and then new message
     (set-memo:value memo 
-		    (+ (time) 
-		       (options-session-lifetime)))
+		    (+ (time) time-to-live))
     (set-memo:new-memo memo new-memo)
     ;; I don't think we need locking here. Do you agree?
     (set-session-memo! session new-memo)