fix(lemmy): use `@text` for body text

[ttollet]

🔧 What does this fix? 🔧

Latte theme with pink (or similarly light) accent choices resulted in illegible body text, such as comments. This fixes the issue by setting body text to @text color instead of @accent-color.

(before) Latte Pink with @accent-colored text as prior:

(after) Resolved with @text colored text:

NB: @accent-color is still used across the theme elsewhere.

🗒 Checklist 🗒

• [x] I have read and followed Catppuccin's contributing guidelines.
• [x] I have updated the version appropriately in the ==UserStyle== header of the catppuccin.user.css file.