fix #87 space in front of first column in customvirtuallistctl

see upstream bugreport in wxwidgets:
http://trac.wxwidgets.org/ticket/12041

msdn describes state icons are shown infront of normal icons:

    An image list that contains state images, which are displayed
    to the left of the full-sized or small icon. You can use state
    images, such as checked and cleared check boxes, to indicate
    application-defined item states. State images are displayed
    in icon view, small icon view, list view, and report view.

wx doc describes wxIMAGE_LIST_STATE as unimplemented

lets try to remove