Add code so `tunnel=building_passage` doesn't default to `layer=-1` (closes #4516)
Add code so `tunnel=building_passage` doesn't default to `layer=-1`
(closes #4516)

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