BackupWebStorage has no effect

Setting the BackupWebStorage preference seems to have no effect.

1. Set BackupWebStorage in config.xml to local or none.

2. Build, install, and launch app.

3. On iOS device, open Settings -> iCloud -> Storage -> Manage Storage -> my_device_name -> Show All Apps

Expected: app should not appear since no data should be in storage.

Observed: app appears in iCloud storage regardless of BackupWebStorage setting.