Remove unused "machine_preferences" section
Remove unused "machine_preferences" section

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