Filename is now correctly set for 3mf
Filename is now correctly set for 3mf

CURA-1622

Curahelper/Cura,Curahelper/Cura,totalretribution/Cura,hmflash/Cura,senttech/Cura,ynotstartups/Wanhao,totalretribution/Cura,hmflash/Cura,ynotstartups/Wanhao,senttech/Cura,fieldOfView/Cura,fieldOfView/Cura