BUG: Ensure Slicer ITKFactory plugins are loaded

After the update of CTK in r23256, the instantiation of the ctkErrorLogModel
was done before calling qSlicerCoreApplication::init(). This commit moves
the instantiation after the call to init() where the ITK_AUTOLOAD_PATH
was set. This will ensure the dynamic factories are discovered and loaded.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23298 3bd1e089-480b-0410-8dfb-8563597acbee