Werk #4470: Event console: fixed incorrect event counting for timed-out and heartbeat events

The internal event counter of status_num_open_events (and others) was not correctly decreased for

• events with timeouts, e.g. an event with a lifetime
• events which expect something in a given interval

Since this event count never decreased, the limits specified in the global settings rule Limit amount of current events, were reached when the event console ran for a certain amount of time. A restart always fixed this problem, because these counts are calculated from scratch during startup.

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