JSON fix: only enable skin expansion settings when we have it enabled (CURA-3440)
JSON fix: only enable skin expansion settings when we have it enabled (CURA-3440)

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