disable shelf shadows if "noshadow" data item exists in shelf theme
disable shelf shadows if "noshadow" data item exists in shelf theme

this used to be handled by the "shaped" flag back when shelves had their
own windows, but the handling for it was lost during the transition away from
the E18 compositor

tasn/enlightenment,tasn/enlightenment,rvandegrift/e,tasn/enlightenment,rvandegrift/e,rvandegrift/e