Werk #8153: Fix notification delay if delay is greater than 2147 seconds

If you configured a notification delay of more than 2147 seconds (approx 35 minutes, precisely 2^31 micro seconds) then due to an internal range overflow the actual delay would be somewhere between -2147 and +2147 seconds. So in some cases the delay was just too short, in other it was negative and that way totally ineffective. This has been fixed.

To the list of all Werks