Fix zoom scaleExtent to allow zoom out to z2 (full map) (closes #4959)
Fix zoom scaleExtent to allow zoom out to z2 (full map)
(closes #4959)

Also includes some code formatting and cleanup

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