gnu: sonata: Don't use unstable tarball.

* gnu/packages/mpd.scm (sonata)[source]: Download using git-fetch.

gnu/packages/mpd.scm

@@ -299,14 +299,14 @@ interface for the Music Player Daemon.")
     (name "sonata")
     (version "1.7b1")
     (source (origin
-              (method url-fetch)
-              (uri
-               (string-append "https://github.com/multani/sonata/archive/v"
-                              version ".tar.gz"))
-              (file-name (string-append name "-" version ".tar.gz"))
+              (method git-fetch)
+              (uri (git-reference
+                     (url "https://github.com/multani/sonata")
+                     (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
               (sha256
                (base32
-                "07gq2nxqwxs0qyxjbay7k5j25zd386bn7wdr2dl1gk53diwnn7s0"))))
+                "1npbxlrg6k154qybfd250nq2p96kxdsdkj9wwnp93gljnii3g8wh"))))
     (build-system python-build-system)
     (arguments
      `(#:modules ((guix build gnu-build-system)