Add clear button to the OpenPGP Key configuration.
Add clear button to the OpenPGP Key configuration.

svn path=/trunk/kdenetwork/kmail/; revision=129427

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