Re: [sensors] https://w3c.github.io/sensors/#construct-sensor-object is doing weird things with frequency

Would changing the [init 
dictionary](https://w3c.github.io/sensors/#dictdef-sensoroptions) like
 so fix the issue?

```webidl
dictionary SensorOptions {
  double? frequency = null;
};
```

The intent is for `frequency` to be `null` unless specified by the API
 consumer. I wrongly(?) assumed `double?` by itself defaulted to 
`null` if not value was set.

As a sidenote, sorry for not being more reactive on this front, but 
I'm still [in between 
contracts](https://lists.w3.org/Archives/Public/public-device-apis/2016Jun/0041.html)
 here.

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