Remove background color for FluentPaginator nav

[lus]

Pull Request

📖 Description

The navigation child element of the FluentPaginator has a background color set.
This seems to be off, as it looks like this when placing it on a FluentCard for example:

By removing the background color, it simply inherits the background color of the element it is placed on:

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have added Unit Tests for my new compontent
• I have modified an existing component
• I have validate Unit Tests for an existing component