gnu: openttd: Update to 1.10.0.

The os/dos subdirectory has been removed by upstream commit:
fdb804d86bcab8d0529bdf6ca925bed04ad2f047

* gnu/packages/games.scm (openttd)[version]: Update to 1.10.0.
[source]: Change uri to cdn.openttd.org, remove snippet & modules.

gnu/packages/games.scm

@@ -2971,20 +2971,14 @@ (define-public manaplus
 (define openttd-engine
   (package
     (name "openttd-engine")
-    (version "1.9.3")
+    (version "1.10.0")
     (source
      (origin (method url-fetch)
-             (uri (string-append "https://proxy.binaries.openttd.org/openttd-releases/"
+             (uri (string-append "https://cdn.openttd.org/openttd-releases/"
                                  version "/openttd-" version "-source.tar.xz"))
              (sha256
               (base32
-               "0ijq72kgx997ggw40i5f4a3nf7y2g72z37l47i18yjvgbdzy320r"))
-             (modules '((guix build utils)))
-             (snippet
-              ;; The DOS port contains proprietary software.
-              '(begin
-                 (delete-file-recursively "os/dos")
-                 #t))))
+               "0lz2y2rjc23k0d97y65cqhy2splw9cmrbvhgz0iqps8xkan1m8hv"))))
     (build-system gnu-build-system)
     (arguments
      `(#:tests? #f              ; no "check" target