[openstreetmap/openstreetmap-website] GPX import fails with multi trace archives (#2253)

[Tom Hughes]

The new rails GPX import fails if given an archive containing multiple traces:

```
Traceback (most recent call last):
        7: from (irb):1
        6: from app/models/trace.rb:287:in `import'
        5: from app/models/trace.rb:287:in `each_slice'
        4: from app/models/trace.rb:287:in `each'
        3: from lib/gpx.rb:28:in `points'
        2: from lib/gpx.rb:28:in `read'
        1: from config/initializers/libxml.rb:4:in `block in <main>'
LibXML::XML::Error (Fatal error: XML declaration allowed only at the start of the document at :1422.)
```

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https://github.com/openstreetmap/openstreetmap-website/issues/2253
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