Remove the avatar column on blogs directory page

Hello, I recently installed the blogs directory plugin. It works well for my purpose, but I don't like the layout of the table it creates.

I would like to remove the column where the avatars go, because it is empty. I know I can install the avatar plugin and all that, but it's not needed for my network. So I'd like to remove the empty column. Any suggestions?

Alternatively, if it's possible to get the plugin to grab the WP native Site Icon that would be much more useful.