Twenty Twenty-One: Revert 63549 which brings in margin fix.

The tests were failing on the theme as adresult of bringing in this once committed. For now, reverting until explore.

See #60366.


git-svn-id: https://develop.svn.wordpress.org/trunk@60367 602fd350-edb4-49c9-b593-d223f7449a82

Author: karmatosed

src/wp-content/themes/twentytwentyone/assets/css/style-editor.css

@@ -2648,6 +2648,3 @@ a {
 .has-red-to-purple-gradient-background {
 	background: linear-gradient(160deg, var(--global--color-red), var(--global--color-purple));
 }
-.wp-block-list [data-block] {
-	margin: 0;
-}