Werk #10779: Fix sorting by WATO folder

Component	Setup
Title	Fix sorting by WATO folder
Date	Apr 22, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0p12 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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