[Tile-serving] [openstreetmap/mod_tile] Tiles cache does not work for low zoom (#260)

[adam-boduch]

I ran `render_list` to create titles cache.

```
Meta tiles rendered: Rendered 1398103 tiles in 61960.41 seconds (22.56 tiles/s)
Total tiles rendered: Rendered 89478592 tiles in 61960.41 seconds (1444.13 tiles/s)
Total tiles handled: Rendered 1398103 tiles in 61960.41 seconds (22.56 tiles/s)
*****************************************************
Zoom 01: min:  1.2    avg:  1.2     max:  1.2     over a total of      1.2s in 1 requests
Zoom 02: min: 104.1    avg: 104.1     max: 104.1     over a total of    104.1s in 1 requests
Zoom 03: min: 104.2    avg: 104.2     max: 104.2     over a total of    104.2s in 1 requests
Zoom 04: min:  0.6    avg: 535.4     max: 1605.0     over a total of   1606.2s in 3 requests
Zoom 05: min:  0.2    avg: 121.8     max: 1583.3     over a total of   1826.5s in 15 requests
Zoom 06: min:  0.2    avg: 61.8     max: 1750.2     over a total of   3952.6s in 64 requests
Zoom 07: min:  0.2    avg: 15.6     max: 1294.7     over a total of   3971.6s in 255 requests
Zoom 08: min:  0.2    avg:  6.2     max: 892.9     over a total of   6375.1s in 1024 requests
Zoom 09: min:  0.2    avg:  1.7     max: 599.4     over a total of   7071.1s in 4096 requests
Zoom 10: min:  0.2    avg:  0.6     max: 237.7     over a total of  10385.3s in 16384 requests
Zoom 11: min:  0.2    avg:  0.5     max: 174.2     over a total of  32224.5s in 65536 requests
Zoom 12: min:  0.2    avg:  0.3     max: 122.0     over a total of  91320.5s in 262141 requests
Zoom 13: min:  0.2    avg:  0.3     max: 96.5     over a total of 314768.3s in 1048564 requests
```

Cache works fine for higher zoom. For lower zoom tiles are being rendered over and over again instead of being read from cache.   

[Fri Sep 03 10:42:41.600301 2021] [tile:debug] [pid 19:tid 139994266433280] ./src/mod_tile.c(374): [client 10.0.3.10:55890] tile_state: determined state of ajt 5 4 4 on store 7f52e4000f50: Tile size: 149379, expired: 1 created: 1630391540

As you can see tile was created 3 days ago but still it's expired already.



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