Added more padding/gap in context menu, #16696

[asawyermarathon]

Description

Added more padding/gap in context menu. There are multiple ways of doing this, but I just altered the css variable --uui-menu-item-flat-structure for the list item.

Types of changes

CSS variable change for #action-modal umb-entity-action-list

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Chore (minor updates related to the tooling or maintenance of the repository, does not impact compiled assets)

Motivation and context

Padding alignment for https://github.com/umbraco/Umbraco-CMS/issues/16696

How to test?

Screenshots (if appropriate)

Checklist

• [x] If my change requires a change to the documentation, I have updated the documentation in this pull request.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.