JSON fix: no initial layer temperature commands for the UM2 family (CURA-2781, CURA-2736)
JSON fix: no initial layer temperature commands for the UM2 family (CURA-2781, CURA-2736)

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