Fixes a bug where cookie expiration time is too far in the future.

I noticed that the cookie expiration time was wrong when setting something like $f3->set('JAR.expire',time()+ (60*60*24*30));. Instead of it being 30 days in the future it was adding the time() again to the value. This change fixes this by making sure the session_set_cookie_params gets the right format for it's expiration.