Werk #13004: Fix audit log export to contain only csv data

Component	Setup
Title	Fix audit log export to contain only csv data
Date	Sep 2, 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 2.0.0p10 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Audit log contained html tags after the exported csv data. This has been fixed.

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