Varia: fix interpolation issue in comment meta.

varia/sass/components/comments/_comments.scss

@@ -79,7 +79,7 @@
 
 	$avatar-size: #{map-deep-get($config-global, "spacing", "vertical")};
 
-	margin-right: calc( $avatar-size + (0.5 * #{map-deep-get($config-global, "spacing", "horizontal")}) );
+	margin-right: calc( #{$avatar-size} + (0.5 * #{map-deep-get($config-global, "spacing", "horizontal")}) );
 
 	.comment-author {
 		line-height: #{map-deep-get($config-global, "font", "line-height", "heading")};