Prevent showing wrong speeds on initial open

Previous attempt was the onCompleted block. However it turns out that at that point the model still has the old byte amounts. The order is showSpeedChanged -> setRefreshRate -> Timer.onCompleted/runningChanged -> model updates So set the amount to 0 in onCompleted and trigger the Timer on start (like a Timer with 0 interval). This initial trigger happens after the odel gets a new value and we have a correct amount on the first regular trigger of the Timer.