Remove reference to depreciated bad_gateway model.

Addresses #1078

I too enjoy breaking changes with no warning. Round two.

allianceauth/project_template/project_name/settings/base.py

@@ -194,6 +194,8 @@ LOGIN_TOKEN_SCOPES = ['publicData']
 # number of days email verification links are valid for
 ACCOUNT_ACTIVATION_DAYS = 1
 
+ESI_API_URL = 'https://esi.evetech.net/'
+
 LOGGING = {
     'version': 1,
     'disable_existing_loggers': False,