[openstreetmap-website] Always run tests using example.application.yml (#404)

[John Firebaugh]

This fixes an Oauth integration test failure when a custom application.yml is
present.
You can merge this Pull Request by running:

  git pull https://github.com/osmlab/openstreetmap-website fix-oauth-tests

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

  https://github.com/openstreetmap/openstreetmap-website/pull/404

-- Commit Summary --

  * Always run tests using example.application.yml

-- File Changes --

    M config/preinitializer.rb (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/404.patch
https://github.com/openstreetmap/openstreetmap-website/pull/404.diff

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