Werk #13245: Fix error on editing labels in rule conditions

Component	User interface
Title	Fix error on editing labels in rule conditions
Date	Sep 21, 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) 2.0.0p12 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

If existing label conditions in rulesets were edited, e.g. "foo:bar" to "foo:baz", the error "Only one value per KEY can be used at a time.foo:baz is already used." occured.

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