Move require statements to proper place in evaluated lisp expression

* org-agenda.el (org-write-agenda): Move require statements to proper
place in evaluated lisp expression.

lisp/org-agenda.el

@@ -2503,9 +2503,6 @@ higher priority settings."
   (interactive "FWrite agenda to file: \nP")
   (if (not (file-writable-p file))
       (error "Cannot write agenda to file %s" file))
-  (cond
-   ((string-match "\\.html?\\'" file) (require 'htmlize))
-   ((string-match "\\.ps\\'" file) (require 'ps-print)))
   (org-let (if nosettings nil org-agenda-exporter-settings)
     '(save-excursion
        (save-window-excursion
@@ -2527,6 +2524,7 @@ higher priority settings."
 	      ((org-bound-and-true-p org-mobile-creating-agendas)
 	       (org-mobile-write-agenda-for-mobile file))
 	      ((string-match "\\.html?\\'" file)
+	       (require 'htmlize)
 	       (set-buffer (htmlize-buffer (current-buffer)))
 
 	       (when (and org-agenda-export-html-style