gnu: denemo: Improve package style.

* gnu/packages/music.scm (denemo)[native-inputs]: Remove labels.
[arguments]: Use G-expressions.  Remove trailing #T from phases.

gnu/packages/music.scm

@@ -628,8 +628,9 @@ many input formats and provides a customisable Vi-style user interface.")
         (base32 "0pdmjij2635jbw2a24ivk1y4w0z58jbmq9vnz3qrfzw4d469grab"))))
     (build-system gnu-build-system)
     (arguments
-     `(#:phases
-       (modify-phases %standard-phases
+     (list
+      #:phases
+      #~(modify-phases %standard-phases
           (replace 'check
             (lambda* (#:key inputs #:allow-other-keys)
               ;; Tests require to write $HOME.
@@ -650,15 +651,14 @@ many input formats and provides a customisable Vi-style user interface.")
                   (("g_string_new \\(\"lilypond\"\\);")
                    (string-append "g_string_new (\""
                                   lilypond
-                                 "\");"))))
-             #t)))))
+                                  "\");")))))))))
     (native-inputs
-     `(("diffutils" ,diffutils)
-       ("glib:bin" ,glib "bin")         ; for gtester
-       ("gtk-doc" ,gtk-doc)
-       ("intltool" ,intltool)
-       ("libtool" ,libtool)
-       ("pkg-config" ,pkg-config)))
+     (list diffutils
+           `(,glib "bin")               ; for gtester
+           gtk-doc
+           intltool
+           libtool
+           pkg-config))
     (inputs
      (list alsa-lib
            aubio