[openstreetmap-website] Only show scrollbars if needed in markdown input (#277)

[Leo Koppelkamm]

![screen shot 2013-05-12 at 19 35 01](https://f.cloud.github.com/assets/183302/493225/690c26cc-bb2a-11e2-9c54-d19bcfb1774d.png)


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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/277#issuecomment-17781740
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