Upgrade uglify-js to 3.3.25 (closes #4886, closes #4873)
Upgrade uglify-js to 3.3.25
(closes #4886, closes #4873)

There was an unknown issue before causing uglify to fail, but seems
resolved with current version, tested on Node 6, 8, and 10

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