Fix path to gii assets 

```
Invalid Parameter – yii\base\InvalidParamException

The file or directory to be published does not exist: /home/lav45/www/advanced/vendor/yiisoft/yii2/yii/gii/assets
1. in /home/lav45/www/advanced/vendor/yiisoft/yii2/yii/web/AssetManager.php at line 207
```