gnu: retux: Update to 1.4.1-1.

* gnu/packages/games.scm (retux): Add let binding and update to 1.4.1-1.
[version]: Update version string.
[source]: Update URL.

gnu/packages/games.scm

@@ -1811,18 +1811,23 @@ Every puzzle has a complete solution, although there may be more than one.")
    (license license:gpl2+)))
 
 (define-public retux
+  (let ((release "1.4.1")
+        (revision 1))
     (package
       (name "retux")
-    (version "1.4")
+      (version (if (zero? revision)
+                   release
+                   (string-append release "-"
+                                  (number->string revision))))
       (source (origin
                 (method url-fetch)
                 (uri (string-append "https://github.com/retux-game/retux/"
                                     "releases/download/v"
-                                  (version-major+minor version) "/retux-"
-                                  version "-src.tar.gz"))
+                                    version "/retux-"
+                                    release "-src.tar.gz"))
                 (sha256
                  (base32
-                "1hxy1pvlxhk0ci3wh2i3mmr82faqdjnnxsiwwr5gcr93nfnw9w5f"))))
+                  "1vrldg2qh2gqfswj7vkpc589ldrrjd903j6cnfdik9zh0jhlq4h2"))))
       (build-system python-build-system)
       (arguments
        `(#:tests? #f                    ; no check target
@@ -1862,7 +1867,7 @@ utilizing the art assets from the @code{SuperTux} project.")
                      license:cc-by-sa3.0
                      license:cc-by-sa4.0
                      license:gpl2+
-                   license:gpl3+))))
+                     license:gpl3+)))))
 
 (define-public roguebox-adventures
   (package