RTL fixes.

publication/editor-blocks.css

@@ -387,7 +387,7 @@
 }
 
 .wp-block-freeform.block-library-rich-text__tinymce blockquote {
-	border-left: 0;
+	border: 0;
 	border-bottom: 3px solid currentcolor;
 	border-top: 3px solid currentColor;
 	color: #555;
@@ -412,9 +412,10 @@
 }
 
 .rtl .wp-block-freeform.block-library-rich-text__tinymce blockquote {
+	border-right: 0;
 	margin-right: 0;
 	padding-left: 0;
-	padding-right: 24px;
+	padding-right: 0;
 }
 
 .rtl .wp-block-freeform.block-library-rich-text__tinymce .alignleft {