Restore the old default hard coded size of (550, 660) for viewing attachments.
Restore the old default hard coded size of (550, 660) for viewing attachments.

svn path=/trunk/kdenetwork/kmail/; revision=176062

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