refactor: utiliser `spip_logger()` à la place de `spip_log()`

ecrire/action/activer_plugins.php

ecrire/action/api_transmettre.php

ecrire/action/auth.php

ecrire/action/cookie.php

ecrire/action/editer_article.php

ecrire/action/editer_auteur.php

ecrire/action/editer_liens.php

ecrire/action/editer_logo.php

ecrire/action/editer_objet.php

ecrire/action/editer_rubrique.php

ecrire/action/inscrire_auteur.php

ecrire/action/purger.php

ecrire/action/referencer_traduction.php

ecrire/action/session.php

ecrire/action/tester.php

ecrire/auth/ldap.php

ecrire/auth/spip.php

ecrire/balise/id_logo_.php

ecrire/balise/logo_.php

ecrire/balise/url_.php