Change definition of leakage pixels from number of pixels in camera to number of pixels after cleaning?

[maxnoe]

Currently, the two leakage_pixels_width_{1,2} features are defined as the number of pixels after cleaning in the border of the camera divided by the number of pixels of the camera.

I think it would be a better parameter for checks / quality queries etc. if it was the number of pixels after cleaning, i.e. np.count_nonzero(cleaning_mask) instead of geometry.n_pixels.