helpers.load_data has unclear behaviour with dropping columns.

[Baukebrenninkmeijer]

The following section is fairly unclear and should be improved for clarity and simplicity.

    if set(fake.columns.tolist()).issubset(set(real.columns.tolist())):
        real = real[fake.columns]
    elif drop_columns is not None:
        real = real.drop(drop_columns, axis=1)
        try:
            fake = fake.drop(drop_columns, axis=1)
        except:
            print(f'Some of {drop_columns} were not found on fake.index.')
        assert len(fake.columns.tolist()) == len(real.columns.tolist()), \
            f'Real and fake do not have same nr of columns: {len(fake.columns)} and {len(real.columns)}'
        fake.columns = real.columns
    else:
        fake.columns = real.columns