Fix typo that causes exception when !200 response

When we get a non-200 response, we try to log what we got but there was
a typo and instead we ended up throwing an exception:

Failed to load taglist for pgsql-announce: Exception 'Response' object has no attribute 'statuscode'

Fix that by changing statuscode -> status_code.

lib/baselib/lists.py

@@ -360,7 +360,7 @@ OR EXISTS (SELECT 1 FROM mailinglist_whitelist WHERE listid=%(id)s AND email=%(e
             try:
                 r = requests.get(self.taglistsource)
                 if r.status_code != 200:
-                    log(curs, 2, 'mail', "Failed to load taglist for {0}: status code {1}".format(self.name, r.statuscode))
+                    log(curs, 2, 'mail', "Failed to load taglist for {0}: status code {1}".format(self.name, r.status_code))
                     return
                 taglist = r.json()
                 curs.execute("""WITH t AS (SELECT * FROM json_to_recordset(%(json)s) AS (urlname text, name text, description text, sortkey int)),