Werk #14936: logwatch: fix validation for REWRITE state

Component	Checks & agents
Title	logwatch: fix validation for REWRITE state
Date	Oct 10, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p15 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p30 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The validation fot the REWRITE state in the Text logfiles rule (logwatch plugin) was erroring out when the patterns contained a reference to the previously matched groups.

This werk fixes the issue.

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