if not explicitely set to false, expand folders when loading them from OPML
if not explicitely set to false, expand folders when loading them from OPML

svn path=/trunk/KDE/kdepim/akregator/; revision=468535

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