window activity tracker stores network attribute inconsistent to other trackers

[eppfel]

The window activtiy tracker stores the network attribute, inside an object for the value attribute:

{
  date: 1496744616668,
  type: "window",
  value: {
    active: false,
    network: "reddit",
    open: true
  }
}

Other trackers store it on the same level as type and date

{
  date: 1496744621930
  network: "facebook"
  type: "fb-login"
  value: "dc622"
}

This would be easy to fix, but create inconsistency.