[2.3.0] Checkmk Werk 17163 created: Fix "Discovery state" filter

[//]: # (werk v2) # Fix "Discovery state" filter key | value ---------- | --- date | 2024-08-13T14:11:48+00:00 version | 2.3.0p13 class | fix edition | cre component | multisite level | 1 compatible | yes The filter "Discovery state" used, e.g. in the "Unmonitored services" view, was non-functional since version 2.3. No results were shown.