Werk #12304: Fix case where passive checks would remain "passive" until a core restart

Component	Core & setup
Title	Fix case where passive checks would remain "passive" until a core restart
Date	Aug 2, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p9 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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