Remove Agg backend in plot
Remove Agg backend in plot

Looks like applying the Agg backend in the plot_image function disables displaying images in Jupyter because the Agg backed is a non-GUI backend.

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