[w3c/screen-orientation] Double check lock(), event, re/unlock() behaviors (#151)

Given the updated event model in the spec, we need to check the following:

```JS
const p = screen.orientation.lock("landscape");
screen.orientation.onchange = () => orientation.lock("any");
await p; // rejects? 
```

And what happens if:

```JS
const p = screen.orientation.lock("landscape");
screen.orientation.onchange = () => orientation.unlock();
await p; // rejects? 
```

Need to confirm in the spec steps.... we should add tests for this too. 

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