ScrollView Doesn't scroll if the content's position is set using a transform

### Problem description
When setting a transform property on a widget inside a ScrollView, the ScrollView acts as if there's no content to scroll.

### Expected behavior

I have not use Tabris for a while but I know this was working on Tabris 2.

### Environment

- Tabris.js version:3.0.1
- Device: iPhone 6S
- OS: iOS 12.3.1

### Code snippet

```javascript
const testScrollView = new ScrollView({
width: 200,
height: 200,
background: 'green'
})

contentView.append(testScrollView)

const testComposite = new Composite({
height: 50,
width: 100,
transform: {translationY: 250}
background: 'red'
})

testScrollView.append(testComposite)
```