[Tile-serving] [openstreetmap/mod_tile] Update render queue limits (#152)

[Darafei Praliaskouski]

hey @mmd-osm,
Dirty Queue is not rendered during high load times, and not kept until low load times.
https://munin.openstreetmap.org/openstreetmap/render.openstreetmap/renderd_queue.html

Dirty queue holds all the tiles that were rendered previously and marked dirty due to someone making an edit in the area. They can be rendered on change instead of being rendered later on the first request.

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