Fix transformation artifacts.

The widget does have contents (even if it's inherited) which
was confusing graphicsview and causing wonky artifacts on 
transformations of all widgets that were inside Plasma::ScrollWidget.

svn path=/trunk/KDE/kdelibs/; revision=1179203

widgets/scrollwidget.cpp

@@ -108,7 +108,6 @@ public:
 
     void commonConstructor()
     {
-        q->setFlag(QGraphicsItem::ItemHasNoContents);
         q->setFocusPolicy(Qt::StrongFocus);
         q->setFiltersChildEvents(true);
         layout = new QGraphicsGridLayout(q);