I don't understand, where to insert that hook...
If you want the last item to be linked, you execute the hook like this: {hook h='displayModernBreadCrumb' path=$path linkLast=true}
If you don't want the last item to be linked, you execute the hook like this: {hook h='displayModernBreadCrumb' path=$path} (according to Google's specs the last item is not required to be a link)