Remove reference to celeryd-django

The `celeryd-django` supervisord configuration was removed in aad31dcec1d65fbd8.
Remove a dangling reference to the now non-existent file.

extra/supervisord/supervisord.conf

@@ -26,9 +26,3 @@ serverurl=unix:///tmp/supervisor.sock ; use unix:// schem for a unix sockets.
 # Uncomment this line for celeryd for Python
 ;files=celeryd.conf
 
-# Uncomment this line for celeryd for Django.
-;files=django/celeryd.conf
-
-
-
-