Set byte_order parameter to little in scipy.io.loadmat

ltfatpy/tests/datasets/read_comp_dct_signal_ex_mat.py

ltfatpy/tests/datasets/read_comp_dst_signal_ex_mat.py

ltfatpy/tests/datasets/read_dgt_signal_ex_mat.py

ltfatpy/tests/datasets/read_gabframediag_signal_ex_mat.py

ltfatpy/tests/datasets/read_gabtight_signal_ex_mat.py

ltfatpy/tests/datasets/read_ref_mat.py

ltfatpy/tests/datasets/read_s0norm_ex_mat.py