update opening roi_objects.npz in test_plantcv_cluster_contours_grayscale_input
update opening roi_objects.npz in test_plantcv_cluster_contours_grayscale_input

danforthcenter/plantcv,stiphyMT/plantcv,stiphyMT/plantcv,danforthcenter/plantcv,danforthcenter/plantcv,stiphyMT/plantcv