Remove defaults section from current settings before adding it to a gcode file.
Remove defaults section from current settings before adding it to a gcode file.

Contributes to CURA-936

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