Prettify the output of Zend\Code\Generator\ValueGenerator for multi line arrays

This fix prettifies the output for multi line arrays generated with ```Zend\Code\Generator\ValueGenerator```

Without this fix, an array looks like this. 
```
array(
    'controllers' => array('invokables' => array(
            'Event\Controller\IndexController' => 'Event\Controller\IndexController',
            'Event\Controller\ShopController' => 'Event\Controller\ShopController',
            )),
    'view_manager' => array('template_path_stack' => array(__DIR__ . '/../view'))
    )
```

With the fix, the same array will look like this:

```
array(
    'controllers' => array(
        'invokables' => array(
            'Event\Controller\IndexController' => 'Event\Controller\IndexController',
            'Event\Controller\ShopController' => 'Event\Controller\ShopController',
        )
    ),
    'view_manager' => array(
        'template_path_stack' => array(
            __DIR__ . '/../view'
        )
    )
)
```

Please note the changes for the entry for 'view_manager' and the positions of the braces.