Twenty Twenty: Correct the border style of the pull quote block in the editor.

This change makes the border of the pull quote block visible in the editor when the user selects a border color or thickness,
by setting the default border style to solid.

Props nidhidhandhukiya, ugyensupport, dhruvang21, sabernhardt, divyeshk71, poena.
Fixes #62301.
Built from https://develop.svn.wordpress.org/trunk@59390


git-svn-id: http://core.svn.wordpress.org/trunk@58776 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentytwenty/assets/css/editor-style-block-rtl.css

@@ -791,7 +791,7 @@ hr.wp-block-separator.is-style-dots::before {
 /* Block: Pullquote -------------------------- */
 
 .editor-styles-wrapper .wp-block-pullquote {
-	border: none;
+	border: 0 solid;
 	color: inherit;
 	padding: 0;
 	position: relative;

wp-content/themes/twentytwenty/assets/css/editor-style-block.css

@@ -795,7 +795,7 @@ hr.wp-block-separator.is-style-dots::before {
 /* Block: Pullquote -------------------------- */
 
 .editor-styles-wrapper .wp-block-pullquote {
-	border: none;
+	border: 0 solid;
 	color: inherit;
 	padding: 0;
 	position: relative;

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.8-alpha-59389';
+$wp_version = '6.8-alpha-59390';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.