resample function of ACDCLoaders() fail for resampling 4d data

[feiwu77777]

The function resample_raw_image() for the ACDCLoaders class defines new_res = (1.37, 1.37).

It works for 3d data but when using 4d data it fails at this step:
"rescaled = transform.rescale(im, scale_vector, order=order, preserve_range=True, mode='constant')"

Because scale_vector = [x, x] and im.shape = (256,256,10). Making scale_vector = [x, x, 1] should solve this issue.