Wait for the spinbox to show become active in the previous test. Also use
QWidget::activateWindow() instead of QApplication::setActiveWindow(). Use of the
latter seemed to result in some confusion where QWidget::isActiveWindow()
returned true but QWindow::isActive() on the underlying window returned false,
leading qWaitForWindowActive() to fail.
Also remove superfluous setting of focus. It was just set and verified.
Change-Id: I023cdc2d272e23b2537b32606b7a3bf35bf671ac
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>