Bug: obb_volumefog does not render on func_monitor

### Describe the bug

When viewing an obb_volume fog through a func_monitor, it does not render.

### To Reproduce

1. Open map with obb_volumefog visible from a point_camera
2. Observe it through the monitor and see it not there

### Issue Map

will add later

### Expected Behavior

obb_volume fog should render on func_monitor like it does through portals

### Operating System

_No response_