Update popup.js
Update popup.js

Update according to
https://github.com/miguelcobain/ember-leaflet/commit/621b3a08f7a0f029bc971a5123486aaa68ee51ee

radevco/ember-leaflet,twokul/ember-leaflet,VincentDS/ember-leaflet,nickiaconis/ember-leaflet,greyhwndz/ember-leaflet,nickiaconis/ember-leaflet,VincentDS/ember-leaflet,gabesmed/ember-leaflet,greyhwndz/ember-leaflet,twokul/ember-leaflet,radevco/ember-leaflet,gabesmed/ember-leaflet