gnu: emacs-rec-mode: Use modern package style

* gnu/packages/databases.scm (emacs-rec-mode)[source]<snippet>: Use
G-Expression.
[arguments]: Convert to list of G-Expressions.
[native-inputs]: Drop gratuitous newline.

gnu/packages/databases.scm

@@ -1628,17 +1628,17 @@ types are supported, as is encryption.")
               (sha256
                (base32
                 "1w1q6kh567fd8xismq9i6wr1y893lypd30l452yvydi1qjiq1n6x"))
-              (snippet '(begin (delete-file "rec-mode.info")))))
+              (snippet #~(begin (delete-file "rec-mode.info")))))
     (build-system emacs-build-system)
     (arguments
-     '(#:phases
-       (modify-phases %standard-phases
+     (list
+      #:phases
+      #~(modify-phases %standard-phases
           (add-before 'install 'make-info
             (lambda _
               (invoke "makeinfo" "--no-split"
                       "-o" "rec-mode.info" "rec-mode.texi"))))))
-    (native-inputs
-     (list texinfo))
+    (native-inputs (list texinfo))
     (home-page "https://www.gnu.org/software/recutils/")
     (synopsis "Emacs mode for working with recutils database files")
     (description "This package provides an Emacs major mode @code{rec-mode}