[openstreetmap-website] Work around browser inconsistency in iframe URL resolution (#433)

[John Firebaugh]

Fixes systemed/iD#1672
You can merge this Pull Request by running:

  git pull https://github.com/jfirebaugh/openstreetmap-website id

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/433

-- Commit Summary --

  * Work around browser inconsistency in iframe URL resolution

-- File Changes --

    M app/views/site/id.html.erb (14)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/433.patch
https://github.com/openstreetmap/openstreetmap-website/pull/433.diff

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