Werk #13869: Fix error on editing of timeperiods

Component	Setup
Title	Fix error on editing of timeperiods
Date	Mar 28, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0b5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If timeperiods were edited, the error "This name is already being used by another timeperiod." occurred.

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