Fix single char emoji range issue.

Runtime/ui/txt/emoji.cs

         }
 
         public static bool isSingleCharEmoji(int c) {
-            return (0x2100 <= c && c < 0x3300) || isEmptyEmoji(c);
+            return emojiLookupTable.ContainsKey(c) || isEmptyEmoji(c);
-            return 0x2100 <= c && c < 0x3300;
+            return emojiLookupTable.ContainsKey(c);
         }
 
         public static bool isEmptyEmoji(int c) {