Set light = true instead of dark = false for Catppuccin Latte

[injust]

https://github.com/dandavison/delta/blob/f5b37173fe88a62e37208a9587a0ab4fec0ef107/themes.gitconfig#L22-L24:

# 3. Include either `dark = true` or `light = true` according to whether it is
#    designed for a light or dark terminal background. (This marks a feature as
#    a "theme", causing it to be picked up by `delta --show-themes`).

[Anomalocaridid]

Superceded by #8.