[2.4.0] Checkmk Werk 17168 created: Test notifications: Fix simulation of "Start of downtime"

[//]: # (werk v2) # Test notifications: Fix simulation of "Start of downtime" key | value ---------- | --- date | 2024-09-17T05:19:13+00:00 version | 2.4.0b1 class | fix edition | cre component | notifications level | 1 compatible | yes If you used the simulation method "Start of downtime", the test did not match any rule with event type option "Start or end of a scheduled downtime". This has been fixed.