Layout not correctly computed

### Problem description

The snippet below produces the wrong layout

### Expected behavior

The red composite, containing the RadioButton should have its intrinsic size. Instead it is spanned to fill the entire screen next to the blue TextView.


### Environment

- Tabris.js version: 2.0.0
- Device: iPhone ES
- OS: 10.3.2

### Code snippet

```javascript
new tabris.TextView({
background: 'blue',
text: 'second label',
left: 16,
right: ['#composite', 16],
}).appendTo(tabris.ui.contentView);

let t2 = new tabris.Composite({
id: 'composite',
background: 'red',
right: 16,
}).appendTo(tabris.ui.contentView);

new tabris.RadioButton({text: 'RadioButton'}).appendTo(t2);
```