Merge #1134

1134: Only set the redis address once, fixes #1125 r=mergify[bot] a=kaiyou

## What type of PR?

Bug-fix

## What does this PR do?
We merged two PR that parametrize the redis address in two different ways

### Related issue(s)
- fixes #1125 

## Prerequistes
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

- [ ] In case of feature or enhancement: documentation updated accordingly
- [ ] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/guide.html#changelog) entry file.


Co-authored-by: kaiyou <pierre@jaury.eu>

core/admin/mailu/configuration.py

@@ -8,8 +8,8 @@ DEFAULT_CONFIG = {
     'BABEL_DEFAULT_LOCALE': 'en',
     'BABEL_DEFAULT_TIMEZONE': 'UTC',
     'BOOTSTRAP_SERVE_LOCAL': True,
-    'RATELIMIT_STORAGE_URL': 'redis://%s/2' % (os.getenv("REDIS_ADDRESS", "redis")),
-    'QUOTA_STORAGE_URL': 'redis://%s/1' % (os.getenv("REDIS_ADDRESS", "redis")),
+    'RATELIMIT_STORAGE_URL': '',
+    'QUOTA_STORAGE_URL': '',
     'DEBUG': False,
     'DOMAIN_REGISTRATION': False,
     'TEMPLATES_AUTO_RELOAD': True,