fix: overlaps were compensated twice when layer would start within an overlap zone (CURA-1635)
fix: overlaps were compensated twice when layer would start within an overlap zone (CURA-1635)

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