bugfix: bottom layer speed influenced all layers (CURA-1248)
bugfix: bottom layer speed influenced all layers (CURA-1248)

smoothSpeed never got called for the final speed

totalretribution/CuraEngine,totalretribution/CuraEngine,ROBO3D/CuraEngine,Ultimaker/CuraEngine,alephobjects/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,Ultimaker/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,totalretribution/CuraEngine