Set transient window parent for menu.
Set transient window parent for menu.

Menus as popup should have a parent so
they are not considered top-level windows.

Change-Id: Ifad697da9b6d83fea1d24b9a8a51b81c8cad9e17
Reviewed-by: Jens Bache-Wiig <9cea9d70b08f8210134ec5959114f72bad51ed1d@digia.com>

jfaust/qtquickcontrols,drgvond/qtquickcontrols,drgvond/qtquickcontrols,mizukusak/qtquickcontrols,kobolabs/qtquickcontrols,drgvond/qtquickcontrols,jfaust/qtquickcontrols,richardmg/qtcomponents,kobolabs/qtquickcontrols,mizukusak/qtquickcontrols,richardmg/qtcomponents,kobolabs/qtquickcontrols,mizukusak/qtquickcontrols,jfaust/qtquickcontrols,richardmg/qtcomponents