[Tile-serving] [osm2pgsql] Replace boost::shared_ptr with std::shared_ptr (#402)

[Sarah Hoffmann]

>  #include <boost/format.hpp>
>  #include <boost/noncopyable.hpp>
> -#include <boost/enable_shared_from_this.hpp>
> +#include <memory>

duplicated include

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https://github.com/openstreetmap/osm2pgsql/pull/402/files#r34946107
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