ivi-shell: use weston_compositor_exit

Use the proper function to exit instead of the libwayland one, to allow main
handle_exit() to be called.

This is just to unify the exit paths.

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

ivi-shell/ivi-shell.c

@@ -369,7 +369,7 @@ terminate_binding(struct weston_keyboard *keyboard, const struct timespec *time,
 {
 	struct weston_compositor *compositor = data;
 
-	wl_display_terminate(compositor->wl_display);
+	weston_compositor_exit(compositor);
 }
 
 static void