Update icu.wixproj

Actually pass in the product version number rather than hardcode it to 0.0.0.0

Author: compnerd

platforms/Windows/icu.wixproj

@@ -10,7 +10,7 @@
     <ProjectGuid>07dd2e66-b7f5-40a7-bed1-b3dd2a187c00</ProjectGuid>
     <SchemaVersion>2.0</SchemaVersion>
     <ProductVersion Condition=" '$(ProductVersion)' == '' ">0.0.0</ProductVersion>
-    <ProductVersion>0.0.0</ProductVersion>
+    <ProductVersion>$(ProductVersion)</ProductVersion>
   </PropertyGroup>
 
   <PropertyGroup>