In TypeScript field initializer override properties set by super constructor

### Problem description

```
class Foo extends Composite {
private _bar = 1;
constructor(properties) {
super(properties);
}
set bar(value) {
this._bar = value;
}
get bar() { return this._bar; }
}

console.log(new Foo({bar: 2}).bar);
```
This prints "1"
### Expected behavior
Should print "2"
### Environment

Any tabris version
any TypeScript version
any Platform