Fix use_captcha when False
Fix use_captcha when False

Setting default using Jinja was wrong, fixed so
if use_captcha is False, we get USE_CAPTCHA = False
in local_settings.py, and if use_captcha is True or
missing, we get USE_CAPTCH = True in local_settings.py.

caktus/django-opendebates,caktus/django-opendebates,ejucovy/django-opendebates,ejucovy/django-opendebates,ejucovy/django-opendebates,caktus/django-opendebates,caktus/django-opendebates,ejucovy/django-opendebates