When the QPolygonF type was added to QMetaType it did not bump up the
values in load() and save() for QVariant.
Task-number: QTBUG-33981
Change-Id: I7ad99cda70620c5449c15527c3daf920972d047f
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
