Twenty Fifteen: ensure RTL editor font style is consistent with front-end font style.

Props iamtakashi and alex-ye, see #30746.

git-svn-id: https://develop.svn.wordpress.org/trunk@30956 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-content/themes/twentyfifteen/css/editor-style.css

@@ -453,6 +453,10 @@ a {
  * 8.0 RTL
  */
 
+body.rtl {
+	font-family: "Noto Serif", Tahoma, serif;
+}
+
 .rtl blockquote {
 	border-left: none;
 	border-right: 4px solid #707070;