Werk #13664: Fix required comment field on removing of downtimes

Component	User interface
Title	Fix required comment field on removing of downtimes
Date	Feb 1, 2022
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) 2.0.0p20 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If downtimes were removed, a comment entry was required. This has been changed to optional because for removements of downtimes, no comment is necessary.

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