[openstreetmap/openstreetmap-website] Add marker at trace start coordinate (#1731)

[Matt Amos]

It looks like [`link_to_if`](https://apidock.com/rails/ActionView/Helpers/UrlHelper/link_to_if) isn't going to evaluate the link when `trace.inserted?` is false. I thnk that means that the trace will have non-nil lat/lon whenever `trace.inserted?` is true, so it shouldn't cause a problem?

There are some [other places in the code](https://github.com/openstreetmap/openstreetmap-website/blob/609cedc4998805d38d1607e68c67e491ce589114/app/models/trace.rb#L182-L183) where we're assuming `inserted?` implies lat/lon are present.

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