[Feature?] Ability for mods to unban tags

[Noël]

Some time ago I wrote in Chuu support about accidentally banning tags using global mod permissions (instead of local mod permissions): https://discord.com/channels/894267966970036276/897810116462649394/1091995636217426001

I'm not sure if this reached the correct people, but Chuu doesnt have an unbantag command.

It seems easy enough to fix, but I dont have the codebase downloaded and am having trouble finding what instance the global db is in this line: https://github.com/ishwi/Chuu/blob/master/src/main/java/core/commands/moderation/BanTagCommand.java#L57

The unbantag command would look virtually the same, but alternatively you could go the easy route and make bantag a toggle command instead. Again, I can't find the db service/util but it should be easy enough I hope/think.

We would love to have our melodic death metal and melodeath tags back eventually :-)