Twenty Twenty-One: Allow editor styles to control block margins.

This change removes some overrides that prevented site editor updates in 5.9 from controlling vertical margins via `var(--global--spacing-vertical)`.

Props stacimc, Boniu91, aristath, ironprogrammer, nidhidhandhukiya.
Fixes #54250.


git-svn-id: https://develop.svn.wordpress.org/trunk@52726 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -398,19 +398,6 @@ a:hover {
 /**
  * Block Options
  */
-[data-block].wp-block-buttons {
-	margin-top: 0;
-	margin-bottom: 0;
-}
-
-[data-block].wp-block-buttons .wp-block-button:first-child {
-	margin-top: 30px;
-}
-
-[data-block].wp-block-buttons .wp-block-button:last-child {
-	margin-bottom: 30px;
-}
-
 .wp-block-button:not(.is-style-outline) .wp-block-button__link:not(:hover):not(:active):not(.has-text-color) {
 	color: #d1e4dd;
 }