Varia: migrate sass/blocks/latest-comments

varia/sass/blocks/latest-comments/_style.scss

@@ -20,6 +20,7 @@
 
 	.wp-block-latest-comments__comment-meta {
 		font-family: #{map-deep-get($config-heading, "font", "family")};
+		font-family: var( --font-headings, #{map-deep-get($config-heading, "font", "family")} );
 	}
 
 	.wp-block-latest-comments__comment-date {

varia/style-rtl.css

@@ -1385,6 +1385,7 @@ h4, .h4,
 h5, .h5,
 h6, .h6 {
 	font-family: sans-serif;
+	font-family: var(--font-headings, sans-serif);
 	font-weight: bold;
 	clear: both;
 }

varia/style.css

@@ -1477,6 +1477,7 @@ img {
 
 .wp-block-latest-comments .wp-block-latest-comments__comment-meta {
 	font-family: sans-serif;
+	font-family: var(--font-headings, sans-serif);
 }
 
 .wp-block-latest-comments .wp-block-latest-comments__comment-date {