mail: getDetail subject is now really converted to UTF-8

git-svn-id: https://svn.fournier38.fr/svn/ProgSVN/trunk@3781 bf3deb0d-5f1a-0410-827f-c0cc1f45334c

mail.php

@@ -1356,7 +1356,7 @@ class mail
     }
     $date = trim ($this->getDate ());
     $dateTimestamp = $this->getDateTimestamp ();
-    $subject = $this->getHeaderValue ("Subject");
+    $subject = $this->decodeHeaders ("Subject", $this->getHeader ("Subject"));
     return get_defined_vars();
   }