Function offXRSessionEnd

offXRSessionEnd(fn): void
Remove a listener for when an XR session ends
Parameters
- fn: ((evt: XRSessionEventArgs) => void)
  The function to remove from the listeners
  - - (evt): void
    - Parameters
      evt: XRSessionEventArgs
      Returns void
Returns void
Example
```
const myFunction = (evt) => {
 console.log("XR session ended", evt);
};
onXRSessionEnd(myFunction);
offXRSessionEnd(myFunction);
```