Fix incorrect emoji presentation for 'Zsym' script

If the language tag "und-Zsym" is applied to a TextView, the default
presentation should be text-style. However, it didn't work before this
patch, due to a lack of "und-Zsym" language tag in fonts.xml.

Bug: 31297127
Change-Id: Ieed8fe1532806dd1e75c58aa0d7a724bfeed7796
diff --git a/data/fonts/fonts.xml b/data/fonts/fonts.xml
index 117e17b..345ec37 100644
--- a/data/fonts/fonts.xml
+++ b/data/fonts/fonts.xml
@@ -350,7 +350,7 @@
     <family lang="und-Zsye">
         <font weight="400" style="normal">NotoColorEmoji.ttf</font>
     </family>
-    <family>
+    <family lang="und-Zsym">
         <font weight="400" style="normal">NotoSansSymbols-Regular-Subsetted2.ttf</font>
     </family>
     <family>