Dashboard UI sending changed_input field at wrong level in input_changed event

[MichaelBurgess]

We are sending this:

{
  "payload" : {
    "dashboard" : {
      "full_name" : "dashboard_inputs.dashboard.testing_dashboard_inputs"
    },
    "inputs" : {
      "input.new_input" : "____hello"
    }
  },
  "action" : "input_changed",
  "changed_input" : "input.new_input"
}

But it should be like this:

{
  "payload" : {
    "dashboard" : {
      "full_name" : "dashboard_inputs.dashboard.testing_dashboard_inputs"
    },
    "inputs" : {
      "input.new_input" : "____hello"
    },
    "changed_input" : "input.new_input"
  },
  "action" : "input_changed"
}