[Tile-serving] [osm2pgsql] Regression tests missing default.style (#490)

[Paul Norman]

```
test_regression_simple
NOTICE:  database "osm2pgsql-test-25469-1443121178" does not exist, skipping
Couldn't open style file 'default.style': No such file or directory
FAIL
```

Perhaps related to #478

cc @alex85k 

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/490
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