Twenty Sixteen: Add `border-radius` to avatar images in the editor.

This ensures that avatars design in the Post Author or Avatar blocks in the editor matches the front end.

Props pitamdey, sabernhardt, poena, shailu25.
Fixes #59253.
Built from https://develop.svn.wordpress.org/trunk@57577


git-svn-id: http://core.svn.wordpress.org/trunk@57078 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentysixteen/css/editor-blocks.css

@@ -634,6 +634,13 @@ Description: Used to style blocks in the editor.
 	margin-bottom: 16px;
 }
 
+/* Avatar & Post Author */
+
+.editor-styles-wrapper .avatar,
+.wp-block-post-author__avatar img {
+	border-radius: 50%;
+}
+
 /*--------------------------------------------------------------
 7.0 Blocks - Colors
 --------------------------------------------------------------*/

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.5-alpha-57576';
+$wp_version = '6.5-alpha-57577';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.