Werk #11862: Fix label completion

Component	Setup
Title	Fix label completion
Date	Jan 3, 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 2.0.0b4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p20 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The label completion of label input fields was not working. The label completion of the config now uses the labels known to the core to execute the completion.

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