xban.db path

[TechnologyClassroom]

Should xban.db be stored in the logfile path instead of the world path?

The file contains usernames and IP addresses which would usually be stored in the log directory and not the world directory.

[insanity54]

I vote for modstorage as it's a standard. And it's better than ever now that Postgres can be a backend https://github.com/minetest/minetest/pull/12879