gnu: Rename emacs-recutils to emacs-rec-mode.

This fixes ‘guix refresh emacs-rec-mode’.

* gnu/packages/databases.scm (emacs-rec-mode): New variable.
(emacs-recutils): Deprecate in favor of emacs-rec-mode.

gnu/packages/databases.scm

@@ -1343,9 +1343,9 @@ types are supported, as is encryption.")
     (license license:gpl3+)
     (home-page "https://www.gnu.org/software/recutils/")))
 
-(define-public emacs-recutils
+(define-public emacs-rec-mode
   (package
-    (name "emacs-recutils")
+    (name "emacs-rec-mode")
     (version "1.8.2")
     (source (origin
               (method url-fetch)
@@ -1373,6 +1373,9 @@ supports editing, navigation, and querying of recutils database files
 including field and record folding.")
     (license license:gpl3+)))
 
+(define-public emacs-recutils
+  (deprecated-package "emacs-recutils" emacs-rec-mode))
+
 (define-public rocksdb
   (package
     (name "rocksdb")