Clear bindings array in keybinding.off (closes #3111)
Clear bindings array in keybinding.off
(closes #3111)

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