JSON fix: prime tower thickness defaulted to zero, rather than defaulting to full prime tower (CURA-3175)
JSON fix: prime tower thickness defaulted to zero, rather than defaulting to full prime tower (CURA-3175)

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