the `display_nxm_random_samples_image` func shows wrong results in even rows

[Reza-Rajabi]

the display_nxm_random_samples_imag() in the utility.h module works as desired when rows and columns are equal, but it mixes up images when m and n are not the same.

[Reza-Rajabi]

We have test scenario (case 2) that calls on display function. This is helpful to reproduce the issue.