Bug with CBED-cropping code

[jhuang97]

There are two occurrences in utility.h of this --

    for(auto j = 0; j < cropped.get_dimj(); j++)
    {
        for(auto i = 0; i < cropped.get_dimi(); i++)
        {
            cropped.at(i,j) = shifted.at(j,i);
        }
    }

--even though the first index of cropped goes up to dimj. This causes problems if the CBED pattern pixel sizes are not square and --4D-crop and --4D-amax are used. It should be cropped.at(j,i) = shifted.at(i,j); instead.