[Tile-serving] [osm2pgsql] Fix multi tags redeclaration (#337)

[Paul Norman]

> +<osm version="0.6">
> +<!--
> +
> +   1_____2     3_____4
> +   |     |     |     |
> +   |  w1 |     | w2  |
> +   5_____6     7_____8
> +
> +this file defines the above nodes, ways and a relation
> +which contains both w1 and w2.
> +-->
> +  <node id="1" lon="0" lat="1"/>
> +  <node id="2" lon="1" lat="1"/>
> +  <node id="3" lon="2" lat="1"/>
> +  <node id="4" lon="3" lat="1"/>
> +  <node id="5" lon="0" lat="0"/>

0,0 shouldn't be used in tests since it's a special point to the dense backend (#158)

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https://github.com/openstreetmap/osm2pgsql/pull/337/files#r28734678
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