config: vector-2022 table of contents lacks styling

[NovemLinguae]

Reported by Izno at https://en.wikipedia.org/wiki/Wikipedia_talk:Twinkle#Toc_styles_for_config_page

Steps to reproduce

• visit https://en.wikipedia.org/wiki/Wikipedia:Twinkle/Preferences?useskin=vector-2022

What happens?

What should happen instead?
Maybe style it more like vector 2010?

Or add a class to it that makes it behave like a normal vector 2022 table of contents, which would also include having it be in the left sidebar if needed?