This MR fixes a typo in `RigidObject` where for a rigid object, the private member `_body_view` is not defined (since it should be using the `root_view`). The fix changes the reference to be the public `body_view` property.

- Bug fix (non-breaking change which fixes an issue)

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with `./orbit.sh --format`
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my feature works
- [x] I have updated the changelog and the corresponding version in the extension's `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already exists there