placeholder en https

complément à 102b361c ref spip/sites#4837

(cherry picked from commit 872b4540)

formulaires/methodes_upload/distant.html

@@ -2,7 +2,7 @@
     <div class='editer editer_url[ (#ENV**{erreurs}|table_valeur{url}|oui)erreur]'>
         <label for='url#ENV{domid}'><:medias:info_referencer_doc_distant:></label>[
         <span class='erreur_message'>(#ENV**{erreurs}|table_valeur{url})</span>
-        ]<input class='text' placeholder="http://" type="text" name="url" value='#ENV{url}' id="url#ENV{domid}"/>
+        ]<input class='text' placeholder="https://" type="text" name="url" value='#ENV{url}' id="url#ENV{domid}"/>
         <!--editer_url-->
     </div>
 </div>