Werk #12963: Fix BI aggregation work tree

Component	User interface
Title	Fix BI aggregation work tree
Date	Jun 17, 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 2.0.0p6 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p25 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Sometimes several trees were opened when a single tree was clicked to open.

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