Re: [w3c/screen-orientation] cordova-plugin-screen-orientation does not work (#123)

@marcoscaceres, the `lock` promise will resolve with `undefined`, and actually we don't need `if...else` at all.
```
async function fixpositionscreen(){
 try {
  alert('trying...');
  await screen.orientation.lock('portrait-primary'));
                alert('yes, it was blocked');    
 }
 catch(err){
                alert('no, it was not blocked....');
  alert(err);
 }
}
fixpositionscreen();
```
@r4-2017, you can use the [`onchange`](https://w3c.github.io/screen-orientation/#dom-screenorientation-onchange) event handler to monitor actual orientation change.


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