gnu: stumpwm: Improve package definition.

* gnu/packages/wm.scm (stumpwm)[inputs, native-inputs]: Remove labels.
  [arguments]: Use gexp and remote trailing #t in phases.

gnu/packages/wm.scm

@@ -1832,19 +1832,22 @@ Wayland compositors supporting the wlr-output-management protocol.")
        (sha256
         (base32 "12hf70mpwy0ixiyvv8sf8pkwrzz8nb12a8ybvsdpibsxfjxgxnan"))))
     (build-system asdf-build-system/sbcl)
-    (native-inputs `(("fiasco" ,sbcl-fiasco)
-                     ("texinfo" ,texinfo)
+    (native-inputs
+     (list sbcl-fiasco
+           texinfo
 
            ;; To build the manual.
-                     ("autoconf" ,autoconf)
-                     ("automake" ,automake)))
-    (inputs `(("cl-ppcre" ,sbcl-cl-ppcre)
-              ("clx" ,sbcl-clx)
-              ("alexandria" ,sbcl-alexandria)))
+           autoconf
+           automake))
+    (inputs
+     (list sbcl-alexandria
+           sbcl-cl-ppcre
+           sbcl-clx))
     (outputs '("out" "lib"))
     (arguments
-     '(#:phases
-       (modify-phases %standard-phases
+     (list
+      #:phases
+      #~(modify-phases %standard-phases
           (add-after 'unpack 'fix-tests
             (lambda _
               (substitute* "stumpwm-tests.asd"
@@ -1872,8 +1875,7 @@ Wayland compositors supporting the wlr-output-management protocol.")
                       TryExec=~@*~a/bin/stumpwm~@
                       Icon=~@
                       Type=Application~%"
-                    out)))
-               #t)))
+                     out))))))
           (add-after 'install 'install-manual
             (lambda* (#:key (make-flags '()) outputs #:allow-other-keys)
               (let* ((out  (assoc-ref outputs "out"))
@@ -1881,8 +1883,7 @@ Wayland compositors supporting the wlr-output-management protocol.")
                 (invoke "./autogen.sh")
                 (invoke "sh" "./configure" "SHELL=sh")
                 (apply invoke "make" "stumpwm.info" make-flags)
-               (install-file "stumpwm.info" info)
-               #t))))))
+                (install-file "stumpwm.info" info)))))))
     (synopsis "Window manager written in Common Lisp")
     (description "Stumpwm is a window manager written entirely in Common Lisp.
 It attempts to be highly customizable while relying entirely on the keyboard