Checkmk Werk 15219: time_period: disallow builtin timeperiod in timeperiod exclude

ID: 15219 Title: time_period: disallow builtin timeperiod in timeperiod exclude Component: REST API Level: 1 Class: Bug fix Version: 2.2.0i1 This werk fixes an issue where the user could via the REST-API select the builtin time period 24X7 as the timeperiod to exclude in a custom time period. This is no longer possible.