fix(carousel): specifity of carousel bg color

[helms-charity]

Issue

Fixes #263

Description

Changed

Specificity of the default background color was changed to allow for section metadata style to be authored.

Design Specs

I don't have a design spec for the image-carousel-full-width carousel variation, it was created earlier in the year. I am just fixing the background color.

Test URLs

• Before (Changes from main): https://main--merative2--hlxsites.hlx.page/drafts/chelms/2023-zelta-user-conference
• After (Changes from this PR): https://263-carouselbg--merative2--hlxsites.hlx.page/drafts/chelms/2023-zelta-user-conference

Testing Instruction

This example shows the "image carousel full width" variation. Please note that you won't visually see the carousel in the "before" link because it is white-on-white, but it is black on the "after" link.

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