[openstreetmap-website] tab indicator not working for the history tab (#191)

[Martin Raifer]

"View" and "Export" tabs are highlighted by a green background when open. "History" is not:
![export-tab](https://f.cloud.github.com/assets/1927298/72251/799052aa-600a-11e2-9288-c455c737cd48.png)
![history-tab](https://f.cloud.github.com/assets/1927298/72252/7e299268-600a-11e2-9de8-4f14ab601c04.png)


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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/191
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