core: stdcm: fix progress logging by using better remaining time init

[eckter]

Fix #9611

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.50%. Comparing base (0e1ea9b) to head (4a11f5e).
Report is 13 commits behind head on dev.

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9620      +/-   ##
============================================
- Coverage     42.51%   42.50%   -0.01%     
  Complexity     2271     2271              
============================================
  Files          1311     1311              
  Lines        105413   105413              
  Branches       3297     3297              
============================================
- Hits          44812    44802      -10     
- Misses        58655    58665      +10     
  Partials       1946     1946              

Flag	Coverage Δ
core	75.05% <100.00%> (ø)
editoast	73.66% <ø> (-0.04%)	⬇️
front	18.79% <ø> (ø)
gateway	2.19% <ø> (ø)
osrdyne	3.28% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.74% <ø> (ø)

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