Remove unused setting variable

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Author: pombredanne

vulnerablecode/settings.py

@@ -34,10 +34,6 @@
 
 ALLOWED_HOSTS = env.list("ALLOWED_HOSTS", default=[".localhost", "127.0.0.1", "[::1]"])
 
-VULNERABLECODE_REQUIRE_AUTHENTICATION = env.bool(
-    "VULNERABLECODE_REQUIRE_AUTHENTICATION", default=False
-)
-
 VULNERABLECODE_PASSWORD_MIN_LENGTH = env.int("VULNERABLECODE_PASSWORD_MIN_LENGTH", default=14)
 
 # SECURITY WARNING: do not run with debug turned on in production