[[PR Description]]

This PR styles wrap guides. Wrap guides weren't being added to the theme
in the theme importer, and they were also missing from One Dark.

One Dark:

![CleanShot 2023-12-18 at 11 16
48@2x](https://github.com/zed-industries/zed/assets/1714999/5578127f-8d69-4f47-af60-c44de87331e0)

Gruvbox:

![CleanShot 2023-12-18 at 11 17
38@2x](https://github.com/zed-industries/zed/assets/1714999/a2ac5db9-e5bf-4452-9f9d-49f074231587)

Bad border (known importer issue):

![CleanShot 2023-12-18 at 11 17
49@2x](https://github.com/zed-industries/zed/assets/1714999/37d11e37-38b6-4001-aef0-19fc2d925425)

No border (known importer issue):

![CleanShot 2023-12-18 at 11 18
14@2x](https://github.com/zed-industries/zed/assets/1714999/3d74bd8c-514e-4e14-94db-425a39d057ab)


Release Notes:

- N/A