engine: fix Show cloning
engine: fix Show cloning

ShowFunction parameters were not copied
mcallegari/qlcplus,mcallegari/qlcplus,mcallegari/qlcplus,kripton/qlcplus,plugz/qlcplus,plugz/qlcplus,kripton/qlcplus,sbenejam/qlcplus,plugz/qlcplus,kripton/qlcplus,sbenejam/qlcplus,mcallegari/qlcplus,mcallegari/qlcplus,kripton/qlcplus,plugz/qlcplus,kripton/qlcplus,mcallegari/qlcplus,plugz/qlcplus,plugz/qlcplus,mcallegari/qlcplus,kripton/qlcplus,sbenejam/qlcplus,plugz/qlcplus,sbenejam/qlcplus,sbenejam/qlcplus,sbenejam/qlcplus,kripton/qlcplus,sbenejam/qlcplus