Test child widgets (on of which is native) with set cursors.
Similar test as tst_QWidget::setCursor().
Remove tst_manual_childwidget manual test.
Change-Id: Id9f0cf9cdb83ad86534761cf35b5359911a5cc8f
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
a507507ce1