[bugfix] gulp-less import (#2319)

build/webpack.dev.js

@@ -61,7 +61,12 @@ module.exports = {
           'style-loader',
           'css-loader',
           'postcss-loader',
-          'less-loader'
+          {
+            loader: 'less-loader',
+            options: {
+              paths: [path.resolve(__dirname, 'node_modules')]
+            }
+          }
         ]
       },
       {