Bundled Themes: Twenty Twenty resized images are centered inside the editor...

Bundled Themes: Twenty Twenty resized images are centered inside the editor (with no alignment set) since WordPress 5.4.

Fixes the image alignment issue by removing `margin-left: auto;` and `margin-right: auto;` from `.editor-styles-wrapper .wp-block-image.is-resized`.

Props dianeco, JavierCasares.
Fixes #49600.
Built from https://develop.svn.wordpress.org/trunk@47613


git-svn-id: https://core.svn.wordpress.org/trunk@47388 1a063a9b-81f0-0310-95a4-ce76da25c4cd