5751: revert r22107, even cosmetic (most labels on base filters are not displayed); only sidebar gui filter has a custom behavior (around level=2)

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@22115 4ae1f11a-8b86-4847-b8af-ab372f36d1fd