Bundled Themes: Twenty Twenty Author Bio/Post Meta Width in Cover Template in Mobile.

Fixes a bug where the author bio and post meta have no left or right padding in smaller viewports.

Props JarretC.
Fixes #49254.
Built from https://develop.svn.wordpress.org/trunk@47241


git-svn-id: https://core.svn.wordpress.org/trunk@47041 1a063a9b-81f0-0310-95a4-ce76da25c4cd