[openstreetmap-website] Fix print CSS (fixes #379) (#380)

[John Firebaugh]

Tested on Chrome and Firefox. Broken in Opera, but AFAICT,
it always has been, and Opera can't print Leaflet maps
on other sites either.
You can merge this Pull Request by running:

  git pull https://github.com/osmlab/openstreetmap-website 379

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

  https://github.com/openstreetmap/openstreetmap-website/pull/380

-- Commit Summary --

  * Fix print CSS (fixes #379)

-- File Changes --

    M app/assets/stylesheets/print.css (48)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/380.patch
https://github.com/openstreetmap/openstreetmap-website/pull/380.diff

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