Change the default user config file name back to .fg42.el (it's time to merge)

flake.lock

@@ -255,7 +255,6 @@
       "locked": {
         "lastModified": 1712776989,
         "narHash": "sha256-DiZoTYM8FptB4DkyrzdFDMDIMECNCdYpnthjhi0NaRs=",
-        "ref": "refs/heads/main",
         "rev": "5241f9f243cb6099a185db12552a32f70509ada6",
         "revCount": 48,
         "type": "git",

lisp/fg42/init.el

@@ -67,7 +67,7 @@
   (setq user-emacs-directory emacsd)
   (setq user-init-file
         (or (getenv "FG42_CONFIG_FILE")
-            (format "%s/.fg42.v4.el"
+            (format "%s/.fg42.el"
                     (getenv "HOME")))))