qmlui: fix offset when dragging a new fixture in 2D view
qmlui: fix offset when dragging a new fixture in 2D view

plugz/qlcplus,kripton/qlcplus,plugz/qlcplus,plugz/qlcplus,kripton/qlcplus,kripton/qlcplus,mcallegari/qlcplus,kripton/qlcplus,sbenejam/qlcplus,kripton/qlcplus,sbenejam/qlcplus,mcallegari/qlcplus,sbenejam/qlcplus,plugz/qlcplus,sbenejam/qlcplus,kripton/qlcplus,sbenejam/qlcplus,mcallegari/qlcplus,sbenejam/qlcplus,plugz/qlcplus,sbenejam/qlcplus,mcallegari/qlcplus,plugz/qlcplus,mcallegari/qlcplus,plugz/qlcplus,mcallegari/qlcplus,kripton/qlcplus,mcallegari/qlcplus