Update plantcv/plantcv/visualize/overlay_two_imgs.py
Update plantcv/plantcv/visualize/overlay_two_imgs.py

Co-authored-by: Noah Fahlgren <273076a8b6ff7a0ef6e9aa218c719e92c1be6226@gmail.com>
stiphyMT/plantcv,danforthcenter/plantcv,stiphyMT/plantcv,danforthcenter/plantcv,danforthcenter/plantcv,stiphyMT/plantcv