s_n_desc修改成s_w_desc review by 盖剑秋

@@ -86,7 +86,7 @@ export default class BrandProductFilter extends React.Component {
     }
 
     componentWillReceiveProps(nextProps){
-        if(nextProps.selectOrder=='s_t_desc'||nextProps.selectOrder=='s_n_desc'){
+        if(nextProps.selectOrder=='s_t_desc'||nextProps.selectOrder=='s_w_desc'){
              this.setState({
                     selectedIndex: 0,
                 });