7dd7714fd2
Since this is a bin and not a button, and it doesn't have any click/keyboard handling on its own (as in that case it needs a parent button wired like in the messages list controls), it is confusing that it has can_focus set to True. To avoid any confusion, this commit removes it without breaking anything since it had no real use. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1920>