Fix font name mistake in ReadiumCSS-base.css

Author: peaceroad

css/src/modules/ReadiumCSS-base.css

@@ -126,7 +126,7 @@ math {
   /* BIZ UD fonts will work on Windows. If you set half-width (ASCII) characters to `upright` using `text-orientation`, the width of these characters remains narrow. In this case, specify `font-variant-east-asian: full-width;` as well. */
   --RS__serif-ja: "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "BIZ UDPMincho", "Yu Mincho", "ＭＳ Ｐ明朝", "MS PMincho", serif;
   --RS__sans-serif-ja: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ W3", "YuGothic", "BIZ UDPGothic", "Yu Gothic", "ＭＳ Ｐゴシック", "MS PGothic", sans-serif;
-  --RS__serif-ja-v: "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "BIZ UDPMincho", "Yu Mincho", "ＭＳ明朝", "MS Mincho", serif;
+  --RS__serif-ja-v: "Hiragino Mincho ProN", "Hiragino Mincho Pro", "YuMincho", "BIZ UDMincho", "Yu Mincho", "ＭＳ明朝", "MS Mincho", serif;
   --RS__sans-serif-ja-v: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ W3", "YuGothic", "BIZ UDGothic", "Yu Gothic", "ＭＳゴシック", "MS Gothic", sans-serif;
 }