Can't initialize polyscope after creating OffscreenRenderer

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [X] For Python issues, I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the [latest documentation](http://www.open3d.org/docs/latest/) (for `master` branch).

### Describe the issue

I have been trying to run polyscope after I have used open3d OffscreenRenderer in my script and when I run:
`polyscope.init()`
I get :
`RuntimeError: [polyscope] ERROR: Failed to initialize glfw`

Even if I delete the OffScreenRenderer object I still cannot initialize polyscope, maybe something is missing in the clean-up of the object?

### Steps to reproduce the bug

```python
import open3d as o3d
import polyscope as ps

a = o3d.visualization.rendering.OffscreenRenderer(300,300)
try:
ps.init()
except:
del a
ps.init()
```

### Error message

`GLFW emitted error: Win32: Failed to register window class: Class already exists.
Traceback (most recent call last):
File "F:\gkopanas\python_envs\blender\lib\site-packages\IPython\core\interactiveshell.py", line 3378, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "", line 1, in
ps.init()
File "F:\gkopanas\python_envs\blender\lib\site-packages\polyscope\core.py", line 14, in init
psb.init(backend)
RuntimeError: [polyscope] ERROR: Failed to initialize glfw`

### Expected behavior

I should be able to use polyscope or other packages that use glfw after at least I have cleaned-up open3d

### Open3D, Python and System information

```markdown
- Operating system: Windows 10 64-bit
- Python version: Python 3.9.2
- Open3D version: 0.14.1
- System architecture: x86
- Is this a remote workstation?: No
- How did you install Open3D?: pip
- Compiler version (if built from source):
```

### Additional information

_No response_