just call accuracy function when setting r attr
just call accuracy function when setting r attr

ref #5587

AndreasHae/iD,openstreetmap/iD,kartta-labs/iD,digidem/iD,kartta-labs/iD,AndreasHae/iD,morray/iD,openstreetmap/iD,kartta-labs/iD,openstreetmap/iD,digidem/iD,morray/iD,AndreasHae/iD