gnu: l-abbaye-des-morts: Don't use unstable tarball.

This also fixes a build failure due to the use of NAME.

* gnu/packages/games.scm (l-abbaye-des-morts)[source]: Use GIT-FETCH and
GIT-FILE-NAME.

gnu/packages/games.scm

@@ -1269,13 +1269,13 @@ can be explored and changed freely.")
     (version "2.0.1")
     (source
      (origin
-       (method url-fetch)
-       (uri (string-append "https://github.com/nevat/abbayedesmorts-gpl/"
-                           "archive/v" version ".tar.gz"))
-       (file-name (string-append name "-" version ".tar.gz"))
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/nevat/abbayedesmorts-gpl.git")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
        (sha256
-        (base32
-         "1a67b0hq6271dd7pvwndjq29cwn2n8gawwz17xafa3k1hrhf8vw3"))
+        (base32 "1pwqf7r9bqb2p3xrw9i7y8pgr1401fy3mnnqpb1qkhmdl3gqi9hb"))
        (modules '((guix build utils)))
        (snippet
         ;; Unbundle fonts.