JSON fix: use exponent function ** 2 rather than x * x (CURA-2325)
JSON fix: use exponent function ** 2 rather than x * x (CURA-2325)

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