Werk #15164: Let host and service deletion cancel its downtime

Component	Core & setup
Title	Let host and service deletion cancel its downtime
Date	Aug 3, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p8 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Activate change now cancels the downtime of vanished hosts and services.

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