Fix inter_area

[haroldjcastillo]

car-detection-yolo/app_utils.py

Line 56 in 3d32c33

inter_area = (yi2 - yi1) * (xi2 - xi1)

There should be max((yi2 - yi1) , 0) * max((xi2 - xi1), 0), take into account that this value MUST be positive or 0