org.el (org-set-font-lock-defaults): Set font-lock keywords correctly for plain links

* org.el (org-set-font-lock-defaults): Set font-lock keywords
correctly for plain links.

lisp/org.el

@@ -6066,7 +6066,7 @@ needs to be inserted at a specific position in the font-lock sequence.")
 	   ;; Links
 	   (if (memq 'tag lk) '(org-activate-tags (1 'org-tag prepend)))
 	   (if (memq 'angle lk) '(org-activate-angle-links (0 'org-link t)))
-	   (if (memq 'plain lk) '(org-activate-plain-links))
+	   (if (memq 'plain lk) '(org-activate-plain-links (0 'org-link t)))
 	   (if (memq 'bracket lk) '(org-activate-bracket-links (0 'org-link t)))
 	   (if (memq 'radio lk) '(org-activate-target-links (0 'org-link t)))
 	   (if (memq 'date lk) '(org-activate-dates (0 'org-date t)))