Fix possible PHP warning, read default_folders using config->get() to suppo...

Aleksander Machniak

2012-08-21 fe2f0be4352ba0bc213a2c6d4dfcbbddea1a551c

 program/include/rcube_smtp.php

@@ -423,7 +423,7 @@
        $lines[] = $key . ': ' . $value;
      }
    }
    

    return array($from, join(SMTP_MIME_CRLF, $lines) . SMTP_MIME_CRLF);
  }