Fix cartographic tile cache expiration time

[flomonster]

When a tile was queried and the cache was hit, the tile's expiry time was not reset.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 28.27%. Comparing base (4f7b93f) to head (5fbdaac).

Files	Patch %	Lines
editoast/src/views/layers/mod.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #6781      +/-   ##
============================================
- Coverage     28.27%   28.27%   -0.01%     
  Complexity     2177     2177              
============================================
  Files          1048     1048              
  Lines        129976   129978       +2     
  Branches       2577     2577              
============================================
- Hits          36754    36748       -6     
- Misses        91733    91741       +8     
  Partials       1489     1489              

Flag	Coverage Δ
core	79.39% <ø> (ø)
editoast	75.85% <0.00%> (-0.04%)	⬇️
front	8.62% <ø> (ø)
gateway	2.50% <ø> (ø)
railjson_generator	87.26% <ø> (ø)
tests	83.07% <ø> (ø)

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[woshilapin]

Nice and easy to review!