Use raw versionCodes in web apk json.

We missed a spot when transitioning to split apk versions. It ended up
breaking the update prompt for web apks.

This will put the raw universal apk version in the json file, which
should put us back on the right track.

Fixes #8936

build.gradle

@@ -469,7 +469,7 @@ def assembleWebsiteDescriptor = { variant, file ->
         String apkName = file.getName()
 
         String descriptor = "{" +
-                "\"versionCode\" : $canonicalVersionCode," +
+                "\"versionCode\" : ${canonicalVersionCode * postFixSize + abiPostFix['universal']}," +
                 "\"versionName\" : \"$canonicalVersionName\"," +
                 "\"sha256sum\" : \"$digest\"," +
                 "\"url\" : \"$url/$apkName\"" +