show sort indicator for folders, too (fixes bug #3449)
show sort indicator for folders, too (fixes bug #3449)

svn path=/trunk/kdenetwork/kmail/; revision=58429

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