Don't create a separate section header for currentItem

Don't create a separate section header for currentItem

The currentItem FxViewItem contained it's own section item,
which when created would cause the current item delegate
to be repositioned.  This change associates the section item
with the delegate item, via the attached object.

Change-Id: Ie675d545539b56d0f1cf5a9b4ea26668978a5e72
Reviewed-by: Bea Lam <bea.lam@nokia.com>