JSON fix: retraction_hop_after_extruder_switch only visible for dual extrusion (CURA-2727)
JSON fix: retraction_hop_after_extruder_switch only visible for dual extrusion (CURA-2727)

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