Fix the path to the Lumon background.

[forestmonster]

This aligns with
https://docs.warp.dev/terminal/appearance/custom-themes#background-images-and-gradients , which indicates:

    the path is relative to ~/.warp/themes/

Pull Request Template

Discord username (optional)

n/a

Name of theme

Lumon

How Has This Been Tested?

Have you run the python script? python3 ./scripts/gen_theme_previews.py <folder-name-eg-standard>

Yes.

Notes

We cannot accept pull request that include custom background images because:

• of licensing restrictions
• we are trying to keep the binary size of the repo as small as possible (just the yaml files)

If your theme has an intended custom background image, include a comment in the yaml with a link to where people should download it.