Bundled Themes: Misaligned input placeholder text Twenty Twenty.

This fixes placeholder misalignment in Firefox when a `height` is added as an inline style to the input field.

Props aljullu, subratamal.
Fixes #48876.
Built from https://develop.svn.wordpress.org/trunk@46851


git-svn-id: https://core.svn.wordpress.org/trunk@46651 1a063a9b-81f0-0310-95a4-ce76da25c4cd