small bugfix (header listview)
small bugfix (header listview)

svn path=/trunk/kdenetwork/knode/; revision=53374

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi