[Tile-serving] [openstreetmap/mod_tile] Use std::string instead of char* when setting a default value for max_size (#139)

[Marcos Dione]

This fixes compilations in newer systems (Debian Sid, in my case). Also, given that the types listed in the variant declaration (`using value_holder_base = util::variant<value_null,value_integer,value_double,std::string,value_bool>`), I think it makes more sense.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/139

-- Commit Summary --

  * Use std::string instead of char* when setting a default value for max_size.

-- File Changes --

    M src/gen_tile.cpp (5)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/139.patch
https://github.com/openstreetmap/mod_tile/pull/139.diff

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