gnu: powertabeditor: Update to 2.0.0-alpha13.

* gnu/packages/music.scm (powertabeditor): Update to 2.0.0-alpha13.

gnu/packages/music.scm

@@ -1410,22 +1410,18 @@ your own lessons.")
     (license license:gpl3+)))
 
 (define-public powertabeditor
-  ;; This commit is after the switch from catch2 to doctest; I couldn't build
-  ;; powertabeditor with catch2.
-  (let ((commit "c5d39b25b75bf87ec693a3ac5018823b1d87f277")
-        (revision "1"))
   (package
     (name "powertabeditor")
-      (version (git-version "2.0.0-alpha12" revision commit))
+    (version "2.0.0-alpha13")
     (source (origin
               (method git-fetch)
               (uri (git-reference
                     (url "https://github.com/powertab/powertabeditor")
-                      (commit commit)))
+                    (commit version)))
               (file-name (git-file-name name version))
               (sha256
                (base32
-                  "16qhqfvk14bp7s8cwr8ds8zfd80pq603d7aymr7967pnb49kic5z"))))
+                "12il5xzgg53ick5k4ivvvqdagld5pgigiiz6s829kkdaymqr7vx5"))))
     (build-system cmake-build-system)
     (arguments
      `(#:phases
@@ -1449,7 +1445,7 @@ your own lessons.")
     (description
      "Power Tab Editor 2.0 is the successor to the famous original Power Tab
 Editor.  It is compatible with Power Tab Editor 1.7 and Guitar Pro.")
-      (license license:gpl3+))))
+    (license license:gpl3+)))
 
 (define-public jalv-select
   (package