CAM_STUDIO_PITCH doesn't get set

When using monitors, `CAM_STUDIO_PITCH` does not get set by the precompiler, resulting in the monitors not behaving right and the console getting spammed with errors:
```
AN ERROR HAS OCCURED [the index 'CAM_STUDIO_PITCH' does not exist]

CALLSTACK
*FUNCTION [set_camera_studio()] mon_camera.nut line [105]
*FUNCTION [Think()] mon_camera.nut line [70]

LOCALS
[this] TABLE
[this] TABLE
```