Varia: migrate style-rtl.css

varia/style-rtl.css

@@ -3172,6 +3172,7 @@ img#wpstats {
 	color: white;
 	background-color: blue;
 	font-family: sans-serif;
+	font-family: var(--font-headings, sans-serif);
 	font-weight: bold;
 	font-size: 0.83333rem;
 	line-height: 1;