Bundled Themes: Twenty Twenty post navigation links outside of the container.

Fixes a bug where the in-page pagination does not align within the inner container.

Props ataurr, audrasjb, mukesh27.
Fixes #48979.
Built from https://develop.svn.wordpress.org/trunk@47244


git-svn-id: https://core.svn.wordpress.org/trunk@47044 1a063a9b-81f0-0310-95a4-ce76da25c4cd