Werk #12669: downtime: fixing deprecated webapi based downtime script

Component	Core & setup
Title	downtime: fixing deprecated webapi based downtime script
Date	Mar 30, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

In the previous version, setting a service downtime using the now deprecated downtime scripts raised an error. This werk fixes this behavior.

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