Revert "Adwaita: use -gtk-icon-source: none on paned..."
Revert "Adwaita: use -gtk-icon-source: none on paned..."

This reverts commit aceabd4f8016a72d2495b9a3f635bb17e08eedd7.
Since this doesn't make sense, it's just picking the wrong terminal
window...

Distrotech/gnome-themes-standard,DoctorJellyface/gnome-themes-standard,DoctorJellyface/gnome-themes-standard,Distrotech/gnome-themes-standard