Fix a warning due to misquoted function.

elisp/settings.el

@@ -79,10 +79,10 @@
 
 ;; Removes *Completions* from buffer after you've opened a file.
 (add-hook 'minibuffer-exit-hook
-      '(lambda ()
-         (let ((buffer "*Completions*"))
-           (and (get-buffer buffer)
-                (kill-buffer buffer)))))
+          #'(lambda ()
+              (let ((buffer "*Completions*"))
+                (and (get-buffer buffer)
+                     (kill-buffer buffer)))))
 
 ;; Don't show *Buffer list* when opening multiple files at the same time.
 (setq inhibit-startup-buffer-menu t)