update opening input_roi.npz in test_plantcv_roi_objects_grayscale_input
update opening input_roi.npz in test_plantcv_roi_objects_grayscale_input

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