Ensure that ideal middle point finding is more robust.

[KelSolaar]

On footage with clipped data, our middle point finding process does not always work, @quister had some issue with that and I will need to make our approach more robust.

The search is happening here:

idt-calculator/aces/idt/prosumer_camera.py

Line 1068 in 6a36c81

# Searching for the index of ~middle camera code value * 125%