Werk #12285: Fix broken deletion of background jobs from background job detail page

Component	Setup
Title	Fix broken deletion of background jobs from background job detail page
Date	Mar 5, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0b9 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

To the list of all Werks