Re: [mediacapture-image] The (bool or ConstrainDouble) case for pan/tilt/zoom is unclear (#225)

> For example, by saying that if any of the PTZ constraints is not unconstrained or has an ideal value, the permission must be requested.

I would love if we were not forcing web developers to provide "default" values for pan/tilt/zoom as there's no guarantee they would mean the same for all cameras.

```js
// Prompt user to access camera, including camera movement.
await navigator.mediaDevices.getUserMedia({
  video: {
    pan: 0, // Let's cross fingers that 0 means "middle" here ;(
    tilt: 0, // Let's cross fingers that 0 means "middle" here ;(
    zoom: 1, // Let's cross fingers that 1 means "no zoom" here ;(
  }
});
```

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