emacs/dired: don't enable dired-git-info in ranger

It won't correctly disable on `C-c C-e`, but it does work find if
enabled manually.

Also: refactors +dired-enable-git-info-h and map! call

Relevant to #2106

modules/emacs/dired/autoload.el

@@ -7,10 +7,9 @@
   (mapc #'kill-buffer (doom-buffers-in-mode 'dired-mode))
   (message "Killed all dired buffers"))
 
-
 ;;;###autoload
 (defun +dired-enable-git-info-h ()
-  (if (and
-       (not (file-remote-p default-directory))
-       (locate-dominating-file "." ".git"))
-      (dired-git-info-mode 1)))
+  "Enable `dired-git-info-mode' in git repos."
+  (and (not (file-remote-p default-directory))
+       (locate-dominating-file "." ".git")
+       (dired-git-info-mode 1)))