[Tile-serving] [osm2pgsql] Regression tests failing (#419)

[Paul Norman]

I reduced the osc file to what appears to be a minimal file. Removing any change causes it to not generate a duplicate geom


```xml
<?xml version='1.0' encoding='UTF-8'?>
<osmChange version="0.6" generator="Osmosis 0.40.1">
  <modify>
    <way id="66" version="1" timestamp="2013-08-07T15:58:10Z" uid="5" user="Test123" changeset="1">
      <nd ref="181"/>
      <nd ref="124"/>
      <nd ref="121"/>
    </way>
  </modify>
  <modify>
    <node id="7" version="2" timestamp="2013-08-07T15:58:06Z" uid="5" user="Test123" changeset="1" lat="-0.0010452" lon="-0.0031759"/>
  </modify>
  <create>
    <way id="101420" version="1" timestamp="2013-08-07T15:58:08Z" uid="5" user="Test123" changeset="1">
      <nd ref="121"/>
      <nd ref="179"/>
      <nd ref="181"/>
    </way>
  </create>
  <modify>
    <relation id="14" version="2" timestamp="2013-08-07T15:58:12Z" uid="5" user="Test123" changeset="1">
      <member type="way" ref="66" role="outer"/>
      <member type="way" ref="101420" role="outer"/>
      <member type="way" ref="6" role="inner"/>
      <tag k="landuse" v="residential"/>
      <tag k="name" v="Name_way5"/>
      <tag k="type" v="multipolygon"/>
    </relation>
  </modify>
</osmChange>
```

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https://github.com/openstreetmap/osm2pgsql/issues/419#issuecomment-126619887
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