No auth for sprites

[Tristramg]

All the sprites and signaling systems are committed in the public repository.
There is no need to complicate the code with an auth check

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.93%. Comparing base (d1389d4) to head (8cb6e7d).
Report is 1 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10828      +/-   ##
==========================================
- Coverage   81.93%   81.93%   -0.01%     
==========================================
  Files        1084     1084              
  Lines      107216   107199      -17     
  Branches      737      737              
==========================================
- Hits        87846    87829      -17     
  Misses      19329    19329              
  Partials       41       41              

Flag	Coverage Δ
editoast	74.37% <100.00%> (-0.02%)	⬇️
front	89.49% <ø> (ø)
gateway	2.18% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.58% <ø> (ø)
tests	87.91% <ø> (ø)

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