applets/taskmanager: simplify right press handling
Unfortunately, Taphandler's pressed event only triggers when the press is lifted for RMB on Wayland, so we need to use the longPressed signal since it triggers when the button is first pressed.
Unfortunately, Taphandler's pressed event only triggers when the press is lifted for RMB on Wayland, so we need to use the longPressed signal since it triggers when the button is first pressed.