Access Nominatim via HTTPS for location search

[ToeBee]

When trying to do a location search using the "Search worldwide" button, my browser is blocking the request because I loaded osm.org via HTTPS but iD is trying to contact Nominatim via HTTP. I am using Chromium but I think all browsers have become more strict about this in the last year or two.

I see for reverse geocoding Nominatim's URL was changed in 16a2449 but the search feature is still pointing at HTTP. I believe the simplest fix might be to just change line 248 in feature_list.js to point at https://