fix avatar radius (#6971)

hey/style.css

@@ -93,7 +93,8 @@ a {
  * Styles for Author blocks
  * https://github.com/WordPress/gutenberg/issues/24952
  */
-.wp-block-post-author__avatar img {
+.wp-block-post-author__avatar img,
+.wp-block-avatar img {
 	border-radius: 999px;
 	line-height: 0;
 }