Insufficient coverage for Intl.Locale.prototype.getNumberingSystems()

We should have more coverage for numbering systems for locales. This is relatively stable so I think can just test it.

For example, on Chrome:

```javascript
new Intl.Locale("hi").getNumberingSystems()
// ['latn']
```

The correct result should be `['latn', 'deva']`.

ECMA-402 issue: https://github.com/tc39/ecma402/issues/1071

CC @ptomato @anba