Re: [mediacapture-image] Use required keyword in get-only dictionaries where appropriate. (#239)

And as soon as I typed that I realized we can't do that because [UlongRange](https://w3c.github.io/mediacapture-main/getusermedia.html#dictionary-ulongrange-members) et al are also used as input: 
```
dictionary ConstrainULongRange : ULongRange {
```

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Received on Friday, 24 July 2020 17:24:00 UTC