message: Remove defunct `appID` parameter from UnsubscribeVehicleData
diff: <description>
  This function is used to unsubscribe the notifications from the subscribeVehicleData function.
  </description>
  - <param name="appID" type="Integer" mandatory="true">
  - <description>ID of application that requested this RPC.</description>
  - </param>
  <param name="gps" type="Boolean" mandatory="false">
  <description>See GPSData</description>
  </param>
  