[openstreetmap/openstreetmap-website] QT_QPA_PLATFORM for phantomjs headless (#2569)

[Tom Hughes]

Having now tried on my machine, where I use the upstream phantomjs I think I have a better handle on what happened.

The upstream phantomjs actually only has one backend, namely the `phantom` one, so that is why I tried to make `offscreen` conditional. It seems however that, probably as a result of trying various alternatives, I accidentally changed what it was setting the value to at the same time.

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