Make the oneway markers slightly more opaque (closes #3060)
Make the oneway markers slightly more opaque
(closes #3060)

openstreetmap/iD,kartta-labs/iD,edpop/iD,ngageoint/hootenanny-ui,bagage/iD,AndreasHae/iD,edpop/iD,morray/iD,openstreetmap/iD,AndreasHae/iD,1ec5/iD,morray/iD,1ec5/iD,bagage/iD,1ec5/iD,ngageoint/hootenanny-ui,bagage/iD,kartta-labs/iD,mapmeld/iD,mapmeld/iD,kartta-labs/iD,edpop/iD,AndreasHae/iD,openstreetmap/iD,digidem/iD,mapmeld/iD,digidem/iD,ngageoint/hootenanny-ui