Use windows icu by default

Author: ShortDevelopment

Build/Chakra.Build.Default.props

@@ -29,7 +29,7 @@
     <EnableIntl Condition="'$(EnableIntl)'==''">true</EnableIntl>
     <EnableIntl Condition="'$(BuildLite)'=='true'">false</EnableIntl>
 
-    <ChakraICU Condition="'$(ChakraICU)'==''">false</ChakraICU>
+    <ChakraICU Condition="'$(ChakraICU)'==''">windows</ChakraICU>
 
     <BuildChakraICUData Condition="'$(BuildChakraICUData)'=='' AND ('$(ChakraICU)'=='static' OR '$(ChakraICU)'=='shared')">true</BuildChakraICUData>