org-mobile.el (org-mobile-push): Use `org-agenda-tag-filter'.

* org-mobile.el (org-mobile-push): Use `org-agenda-tag-filter'
instead of the obsolete `org-agenda-filter'.

Thanks to Charles Sebold for reporting this.

lisp/org-mobile.el

@@ -303,7 +303,7 @@ create all custom agenda views, for upload to the mobile phone."
   (interactive)
   (let ((a-buffer (get-buffer org-agenda-buffer-name)))
     (let ((org-agenda-buffer-name "*SUMO*")
-	  (org-agenda-filter org-agenda-filter)
+	  (org-agenda-tag-filter org-agenda-tag-filter)
 	  (org-agenda-redo-command org-agenda-redo-command))
       (save-excursion
 	(save-window-excursion