Muted Channels have a brighter font colour than normal channels in Mocha Mauve

As in the title, Muted Channels have a slightly brighter font colour than non-muted channels in Mocha Mauve, which is a little confusing.

The below screenshots compare this theme via Revenge with [the Discord catppuccin mocha mauve theme](https://github.com/catppuccin/discord) via Vencord in a Chromium PWA; the `general` channel is not muted while the other two are.

Please can muted channels have a darker font colour in this port as well?

Start by locating the Mocha Mauve theme's channel color definitions and compare the colors used for muted and normal channels. Done means muted channel text is darker than normal channel text and matches the intended appearance shown in the referenced comparison.

Written by the indexing model from the issue text.