qmlui: fix DMX dump drag item z index
qmlui: fix DMX dump drag item z index

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