fix: let computePrintHeightStatistics not depend on extruder_nr any more (CURA-3737)
fix: let computePrintHeightStatistics not depend on extruder_nr any more (CURA-3737)

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