Twenty Thirteen & Twenty Sixteen: Correct the border of the latest comments block in the editor.

This change hides the top border of the first comment in the latest comments block, so that the design
in the editor and the front looks the same.

Props viralsampat, sabernhardt, aishwarryapande, parthvataliya, imranhasanraaz.
Fixes #62282.

git-svn-id: https://develop.svn.wordpress.org/trunk@59476 602fd350-edb4-49c9-b593-d223f7449a82

Author: carolinan

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

@@ -617,7 +617,7 @@ figure[class*="wp-block-"] > figcaption {
 
 /* Latest Comments */
 
-.editor-block-list__block .wp-block-latest-comments__comment-meta a {
+.editor-styles-wrapper .wp-block-latest-comments__comment-meta a {
 	box-shadow: none;
 	font-weight: 700;
 	text-decoration: none;
@@ -631,7 +631,7 @@ figure[class*="wp-block-"] > figcaption {
 	line-height: 1.6153846154;
 }
 
-.wp-block-latest-comments .wp-block-latest-comments__comment {
+.wp-block-latest-comments .wp-block-latest-comments__comment:not(:first-child) {
 	border-top: 1px solid #d1d1d1;
 	margin-bottom: 0;
 	padding: 1.75em 0;

src/wp-content/themes/twentythirteen/css/editor-blocks.css

@@ -437,7 +437,7 @@ p.has-drop-cap:not(:focus)::first-letter {
 	font-size: 16px;
 }
 
-.wp-block-latest-comments .wp-block-latest-comments__comment {
+.wp-block-latest-comments .wp-block-latest-comments__comment:not(:first-child) {
 	background: url(../images/dotted-line.png) repeat-x left top;
 	margin-bottom: 0;
 	padding: 24px 0;