Checkmk Werk 12845: Cleanup redundant custom sidebar snapin permission

ID: 12845 Title: Cleanup redundant custom sidebar snapin permission Component: Multisite Level: 1 Class: Bug fix Version: 2.1.0i1 Previously there was a duplicate permission declared for each custom sidebar snapin. One permission was registered below the topic "Custom sidebar snapins" and one below "Snapins". The general permission from the "Snapins" section has now been removed for custom snapins.