Werk #15747: Fix macro replacement in special agents

Component	Configuration generation
Title	Fix macro replacement in special agents
Date	May 10, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0b8 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p28 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The use of macros was enabled for special agent parameters with werk 3721, but no longer worked in 2.1. It's fixed with this werk.

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