Werk #12964: Fix editing of labels

Component	User interface
Title	Fix editing of labels
Date	Jun 22, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p7 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

If labels were edited, an error message "Only one value per KEY can be used at a time. label_key:label_value is already used." was shown.

A workaround was, to add the regarding label again.

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