Fix spacing for footer in Modal

[aishad]

Issue summary

When using the Modal component, the footer padding should be consistent with the header and section padding.

Expected behavior

The paddingInlineStart and paddingInlineEnd in the Footer component should be "5", consistent with header and section padding.

Actual behavior

The paddingInlineStart and paddingInlineEnd in the Footer component is "4"

Demo of issue

Steps to reproduce the problem

1. Add a footer to the Modal component.