Remove local reference to fonts/OpenSans (#7215)

p/themes/base-theme/frss.css

@@ -48,8 +48,7 @@
 	font-family: 'OpenSans';
 	font-style: normal;
 	font-weight: 400;
-	src: local('Open Sans'), local('OpenSans'),
-		url('../fonts/OpenSans.woff2') format('woff2'),
+	src: url('../fonts/OpenSans.woff2') format('woff2'),
 		url('../fonts/OpenSans.woff') format('woff');
 }
 

p/themes/base-theme/frss.rtl.css

@@ -48,8 +48,7 @@
 	font-family: 'OpenSans';
 	font-style: normal;
 	font-weight: 400;
-	src: local('Open Sans'), local('OpenSans'),
-		url('../fonts/OpenSans.woff2') format('woff2'),
+	src: url('../fonts/OpenSans.woff2') format('woff2'),
 		url('../fonts/OpenSans.woff') format('woff');
 }