Trajectory endpoint fix

[munrojm]

Trajectory objects from endpoint now have correct number of ionic steps

[codecov-commenter]

Codecov Report

Merging #382 (7c6380f) into main (3f46d1f) will increase coverage by 9.43%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #382      +/-   ##
==========================================
+ Coverage   82.92%   92.35%   +9.43%     
==========================================
  Files          62       85      +23     
  Lines        3063     4528    +1465     
==========================================
+ Hits         2540     4182    +1642     
+ Misses        523      346     -177     

Impacted Files	Coverage Δ
emmet-core/emmet/core/oxidation_states.py	91.11% <ø> (ø)
emmet-api/emmet/api/routes/tasks/utils.py	100.00% <100.00%> (ø)
...builders/emmet/builders/materials/piezoelectric.py	91.89% <0.00%> (ø)
...met-builders/emmet/builders/materials/magnetism.py	96.55% <0.00%> (ø)
emmet-builders/emmet/builders/__init__.py	100.00% <0.00%> (ø)
emmet-core/emmet/core/provenance.py	94.31% <0.00%> (ø)
emmet-builders/emmet/builders/vasp/materials.py	91.50% <0.00%> (ø)
emmet-core/emmet/core/structure_group.py	95.32% <0.00%> (ø)
emmet-core/emmet/core/robocrys.py	100.00% <0.00%> (ø)
... and 28 more

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