gnu: wesnoth: Update to 1.14.1.

* gnu/packages/games.scm (wesnoth): Update to 1.14.1.
[source]: Remove wesnoth-fix-std-bad-cast.patch.
* gnu/packages/patches/wesnoth-fix-std-bad-cast.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Unregister it.