Fix the ApplyOneShotChargeInstanceDto

Fix the Dto send with the call ApplyOneShotChargeInstance.

The API expect:

{
  "subscriptionCode": "5823",
  "oneShotCharge": "CH_SC_OSO_ES"
}

And we are sending:

{
  "subscription": "5823",
  "oneShotCharge": "CH_SC_OSO_ES"
}