qmlui: fix color for fixtures with only a color wheel
qmlui: fix color for fixtures with only a color wheel

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