update conf to use selenium manager

Author: AutomatedTester

nightwatch.conf.js

@@ -39,11 +39,11 @@ module.exports = {
 
       webdriver: {
         start_process: true,
-        server_path: require('chromedriver').path,
+        server_path: '',
         cli_args: [
           // --verbose
         ]
       }
     }
   }
-};
+};