deleted the test code

assets/webpack.config.js

@@ -185,13 +185,6 @@ let config = Encore.getWebpackConfig()
 config = {
   ...config,
 
-  devServer: {
-    client: {
-      overlay: false,
-      logging: 'none'
-    },
-  },
-
   output: {
     ...config.output,
     library: 'Pimcore',