Werk #5476: Fixed notification numbering of periodic notifications

Previously, non-OK state changes during periodic notifications resetted the notification number back to 1, in effect restarting escalations. This was inconsistent with Nagios and is not what one wants: If e.g. a service is in WARN state for quite some time, and then goes to CRIT, one surely wants to continue escalation, not reset it.

This problem has been fixed, so problems correctly escalate now.

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