Use kmheaders::setShowSortIndicator.
Use kmheaders::setShowSortIndicator.

svn path=/trunk/kdenetwork/kmail/; revision=54722

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