Litely-red theme has green background for "select a community" dropdown when creating a post

[RayBB]

Issue Summary

A summary of the bug.

Steps to Reproduce

1. Set theme to litely-red
2. Visit https://lemmy.ml/create_post

Screenshot:

Implementation details

imo there should be no background color for this dropdown.
But if there must be one then it should probably be red.

In the theme file it probably shouldn't have green as the secondary bg color:

lemmy-ui/src/assets/css/themes/litely-red.css

Line 5812 in 850de94

background-color: #00c853 !important;

Where select a community is used:

lemmy-ui/src/shared/components/post/post-form.tsx

Line 364 in 850de94

label: i18n.t("select_a_community"),

PS: I'd like to fix this by removing the color but it's not clear to me where in the css we set this bg-secondary for the communities dropdown.

[dessalines]

The main branch uses a different community dropdown, and is fixed there.