Revert "org-capture: require dired since org-capture might use `dired-buffers'"

This reverts commit f3e563476b452f297bf1b0e466b0b75fb9bb7a23.

lisp/org-capture.el

@@ -52,8 +52,6 @@
   (require 'cl))
 (require 'org)
 (require 'org-mks)
-;; Needed for the variable `dired-buffers'
-(require 'dired)
 
 (declare-function org-datetree-find-date-create "org-datetree"
 		  (date &optional keep-restriction))