ivi-shell: remove add_configured_listener left-over

In all my rebases, this got accidentally left behind. The implementation
was removed in 4a750397 but
32ca791d reintroduced it.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

ivi-shell/ivi-layout-shell.h

@@ -53,10 +53,6 @@ ivi_layout_surface_create(struct weston_surface *wl_surface,
 void
 ivi_layout_init_with_compositor(struct weston_compositor *ec);
 
-void
-ivi_layout_surface_add_configured_listener(struct ivi_layout_surface *ivisurf,
-					   struct wl_listener *listener);
-
 void
 ivi_layout_surface_destroy(struct ivi_layout_surface *ivisurf);