In save mode, escape should cancel and return to browse mode (closes #4230)
In save mode, escape should cancel and return to browse mode
(closes #4230)

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