Try to fix non-zero intial numBytesDownloaded problem.
Try to fix non-zero intial numBytesDownloaded problem.

svn path=/trunk/kdenetwork/kmail/; revision=65603

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