If you want to remove the panel for all users, you’ll need to write à little script to add user meta to the role you want.
When you click on ‘ne plus afficher’ an ajax script add a user meta call something like wpcf7_hide_panel_on, the value is an array with version where the panel will be hidden.
I think there’s maybe a cookie write at the same time as even I remove the user meta, the panel still not show (I did it on local install and the cookie domain are the same…).
You need to dive in the wpcf7 code to really see what happen.