Remove redundant DATABASE_URL settings

These match the new defaults in the settings file.

Author: meshy

Makefile

@@ -22,11 +22,11 @@ build: _uv
 	uv pip install -r requirements.prod.txt -r requirements.dev.txt
 	python manage.py collectstatic --no-input
 	rm --force ccbv.sqlite
-	DATABASE_URL=sqlite:///ccbv.sqlite python manage.py migrate
-	DATABASE_URL=sqlite:///ccbv.sqlite python manage.py load_all_django_versions
+	python manage.py migrate
+	python manage.py load_all_django_versions
 
 run-prod:
-	DATABASE_URL=sqlite:///ccbv.sqlite gunicorn core.wsgi --log-file -
+	gunicorn core.wsgi --log-file -
 
 compile: _uv
 	uv pip compile requirements.prod.in --output-file=requirements.prod.txt