Remove uneeded line, as the default value is already true.
Remove uneeded line, as the default value is already true.

Also fixes Qt warning because setCollapsible() was being called before mDateNavigator mas inserted in the splitter.

svn path=/trunk/KDE/kdepim/; revision=936065

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