Weston: Free allocated cursors array when destroying

This array is allocated in create_cursors(). It should be freed in
destroy_cursors().
diff --git a/clients/window.c b/clients/window.c
index bab5d76..0c6f556 100644
--- a/clients/window.c
+++ b/clients/window.c
@@ -661,6 +661,7 @@
 destroy_cursors(struct display *display)
 {
 	wl_cursor_theme_destroy(display->cursor_theme);
+	free(display->cursors);
 }
 
 struct wl_cursor_image *