gtk-demo: Make rows non-selectable
In the listbox controls demo, rows should not be selectable. This change should help in debugging accessibility problems around non-selectable listboxes, where orca current says "not selected" for each row.
In the listbox controls demo, rows should not be selectable. This change should help in debugging accessibility problems around non-selectable listboxes, where orca current says "not selected" for each row.