Werk #13069: Fix file path manipulation

Component	Setup
Title	Fix file path manipulation
Date	Aug 27, 2021
Level	Trivial Change
Class	Security Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p10 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p26 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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