Fix issue with truncate-lines and visual-line-mode

* lisp/org.el (org-insert-link): Set truncate-line in the *Org Link* buffer
and make sure that it really is set there.

See http://thread.gmane.org/gmane.emacs.orgmode/42447

lisp/org.el

@@ -8889,7 +8889,7 @@ Use TAB to complete link prefixes, then RET for type-specific completion support
 		  (reverse org-stored-links) "\n"))))
       (let ((cw (selected-window)))
 	(select-window (get-buffer-window "*Org Links*" 'visible))
-	(setq truncate-lines t)
+	(with-current-buffer "*Org Links*" (setq truncate-lines) t)
 	(unless (pos-visible-in-window-p (point-max))
 	  (org-fit-window-to-buffer))
 	(and (window-live-p cw) (select-window cw)))