Checkmk Werk 10238: Fix rule matching issue on subfolders with common prefix

ID: 10238 Title: Fix rule matching issue on subfolders with common prefix Component: Core & setup Level: 2 Class: Bug fix Version: 1.7.0i1 When having a folder named "prefix" together with a folder named "prefix_suffix" on the same folder level with a rule on the "prefix" folder, this rule matched on the "prefix_suffix" folder accidentally.