remove duplicate string from properties file, was causing warning on console at startup

intl/uconv/src/unixcharset.properties

@@ -522,5 +522,5 @@ locale.all.zh_TW.ucns=x-euc-tw
 locale.all.Zh_TW.big5=Big5
 # CLE 0.8
 locale.all.zh_TW.Big5=Big5
-# SunOS 5.7 according to pofeng@linux.org.tw
-locale.all.zh_TW.BIG5=Big5
+# SunOS 5.7 according to pofeng@linux.org.tw (already above)
+# locale.all.zh_TW.BIG5=Big5