Minor bug : LSMS Images are flipped

[robin-j412]

Hello. I noticed that loading LSMS image/ntl pairs with this function return a flipped version of the image. It does not affect any experiment but can be a problem when displaying images on a map.

def load(country, year, hhid):
    data = np.load(f'{country}_{year}/{hhid}.npz',
                   allow_pickle=True)

    img = data.f.x[:3]
    ntl = data.f.x[-1]
    return img, ntl