Werk #11864: Fix moving tag groups on tag groups page

Component	Setup
Title	Fix moving tag groups on tag groups page
Date	Jan 5, 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

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