Checkmk Werk 13372: Allow usage of host label conditions in service labels ruleset

ID: 13372 Title: Allow usage of host label conditions in service labels ruleset Component: Setup Level: 1 Class: Bug fix Version: 2.1.0i1 Werk #12840 implemented a validation that the rulesets "Host labels" and "Service labels" can not use host or service labels as conditions. But in the latter, it should be possible to use host label condition, what is possible again from now on.