Checkmk Werk 12615: Fix modification of existing entries while cloning

ID: 12615 Title: Fix modification of existing entries while cloning Component: Multisite Level: 1 Class: Bug fix Version: 2.1.0i1 If you tried to clone e.g. "Bookmark lists", "Custom sidebar elements" or, in CEE, "Graph tunings" or "Service Level Agreements", the existing entry was renamed, no clone was created.