Martin Brennan 2965519c76
DEV: Add auto _map extensions for list site settings with no type (#23331)
Followup to eea74e0e32f704f0756202c3f3ae801bcc8ac8bb. Site settings
which are a list without a list_type should also have the _map
extension added which returns an array based on split("|").

For example:

```
SiteSetting.post_menu_map
=> ["read", "like"]
```
2023-08-30 16:14:06 +10:00
..
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2020-07-21 15:55:03 +08:00
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