btop: ram and disk free space graph color is inverted

[Alexdelia]

The gradient for free space is going from 0% green (b0B) to 100% red (b08). But the 100% free memory/disk is a good thing and shouldn't be red

stylix/modules/btop/hm.nix

Line 47 in de4ee58

theme[free_start]="${base0B}"

current stylix theme:

default btop theme:

I will create a pull request to make stylix theme follow the same color indication as btop