bs_dropdown_item: fixed link and li_class attrs
bs_dropdown_item: fixed link and li_class attrs

my first commit ever :-)
MWDelaney/bootstrap-3-shortcodes,MWDelaney/bootstrap-3-shortcodes,MWDelaney/bootstrap-3-shortcodes,filipstefansson/bootstrap-3-shortcodes,filipstefansson/bootstrap-3-shortcodes