org-update-parent-todo-statistics: Fix infinite loop after 4254a54f8

* lisp/org.el (org-update-parent-todo-statistics): Make sure that we
move to the end of updated cookie at the end of search loop, even when
the cookie has not been updated.

Reported-by: No Wayman <iarchivedmywholelife@gmail.com>
Link: https://orgmode.org/list/87le6pucnv.fsf@gmail.com

lisp/org.el

@@ -9905,6 +9905,7 @@ statistics everywhere."
 					        (max 1 cnt-all)))
 	    	      (format "[%d/%d]" cnt-done cnt-all))
 	    	    ndel (- (match-end 0) checkbox-beg))
+              (goto-char (match-end 0))
               (unless (string-equal new (buffer-substring checkbox-beg (match-end 0)))
 	        (goto-char checkbox-beg)
 	        (insert new)