Fix build command.

Application::__construct() expects an array two parameters were given.


Before this:

```
Fatal error: Uncaught exception 'yii\base\InvalidConfigException' with message '
The "basePath" configuration is required.' in D:\dev\www\vhosts\yii2\framework\b
ase\Application.php:86
Stack trace:
#0 D:\dev\www\vhosts\yii2\build\build(19): yii\base\Application->__construct(Arr
ay, 'D:\dev\www\vhos...')
#1 {main}
  thrown in D:\dev\www\vhosts\yii2\framework\base\Application.php on line 86
```

After:
```
D:\dev\www\vhosts\yii2>build\build
The following commands are available:

* app
* asset
* cache
* help
* locale
* message
* migrate

To see the help of each command, enter:

  yiic help <command-name>

```