Fix default utf8 support in reset_db.
Fix default utf8 support in reset_db.

The behavior was previously reversed which got introduced in 0791541788798247971a652c55a955304bd68d6d
where it seems that the option got read as "force utf-8 support" but it
always has been the other way around.

django-extensions/django-extensions,django-extensions/django-extensions,django-extensions/django-extensions