refactor/fix: call setIsInside only in addMeshLayerToGcode (CURA-893)
refactor/fix: call setIsInside only in addMeshLayerToGcode (CURA-893)

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