gnu: emacs-next-pgtk: Define in terms of emacs-next.

* gnu/packages/emacs.scm (emacs-next-pgtk)[version,source]: Drop fields,
inheriting from emacs-next instead.

gnu/packages/emacs.scm

@@ -342,22 +342,9 @@ (define-public emacs-next
          (prepend autoconf))))))
 
 (define-public emacs-next-pgtk
-  (let ((commit "ae18c8ec4f0ef37c8c9cda473770ff47e41291e2")
-        (revision "1"))
   (package
     (inherit emacs-next)
     (name "emacs-next-pgtk")
-      (version (git-version "28.0.50" revision commit))
-      (source
-       (origin
-         (method git-fetch)
-         (uri (git-reference
-               (url "https://git.savannah.gnu.org/git/emacs.git/")
-               (commit commit)))
-         (file-name (git-file-name name version))
-         (sha256
-          (base32
-           "07hgfqh965zmra0rbmnf63p3lsinpv5hn5payqcrjx25pl75xnaf"))))
     (arguments
      (substitute-keyword-arguments (package-arguments emacs-next)
        ((#:configure-flags flags ''())
@@ -369,9 +356,8 @@ (define-public emacs-next-pgtk
        ,@(package-inputs emacs-next)))
     (home-page "https://github.com/masm11/emacs")
     (synopsis "Emacs text editor with @code{pgtk} and @code{xwidgets} support")
-      (description "This is an unofficial Emacs fork build with a pure-GTK
-graphical toolkit to work natively on Wayland.  In addition to that, xwidgets
-also enabled and works without glitches even on X server."))))
+    (description "This Emacs build implements graphical UI purely in terms of
+GTK and also enables xwidgets.")))
 
 (define-public emacs-minimal
   ;; This is the version that you should use as an input to packages that just