gnu: python-pygame: Use G-Expressions and new-style inputs.

* gnu/packages/game-development.scm (python-pygame)[arguments]: Convert
to list of G-Expressions.
[inputs]: Drop labels.

Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>

gnu/packages/game-development.scm

@@ -1203,9 +1203,10 @@ interface (API).")
                 "0g6j79naab7583kymf1bgxc5l5c9h5laq887rmvh8vw8iyifrl6n"))))
     (build-system python-build-system)
     (arguments
-     `(#:tests? #f                ; tests require pygame to be installed first
+     (list
+      #:tests? #f                 ; tests require pygame to be installed first
       #:phases
-       (modify-phases %standard-phases
+      #~(modify-phases %standard-phases
           (add-after 'unpack 'fix-build-config
             (lambda _
               (substitute* "buildconfig/config_unix.py"
@@ -1231,18 +1232,18 @@ interface (API).")
     (native-inputs
      (list pkg-config))
     (inputs
-     `(("freetype" ,freetype)
-       ("sdl2" ,sdl2)
-       ("sdl2-image" ,sdl2-image)
-       ("sdl2-mixer" ,sdl2-mixer)
-       ("sdl2-ttf" ,sdl2-ttf)
-       ("sdl2-gfx" ,sdl2-gfx)
-       ("libjpeg" ,libjpeg-turbo)
-       ("libpng" ,libpng)
-       ("libX11" ,libx11)
-       ("libsmpeg" ,libsmpeg)
-       ("portmidi" ,portmidi)
-       ("v4l-utils" ,v4l-utils)))
+     (list freetype
+           sdl2
+           sdl2-image
+           sdl2-mixer
+           sdl2-ttf
+           sdl2-gfx
+           libjpeg-turbo
+           libpng
+           libx11
+           libsmpeg
+           portmidi
+           v4l-utils))
     (home-page "https://www.pygame.org")
     (synopsis "SDL wrapper for Python")
     (description "Pygame is a set of Python modules designed for writing games.