Fix passive torque example

[AntoineLeroy]

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This change is 

[codecov]

Codecov Report

Patch coverage: 85.71% and project coverage change: +0.01 🎉

Comparison is base (354ee4e) 81.69% compared to head (de14c12) 81.70%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #626      +/-   ##
==========================================
+ Coverage   81.69%   81.70%   +0.01%     
==========================================
  Files         107      108       +1     
  Lines       11849    11924      +75     
==========================================
+ Hits         9680     9743      +63     
- Misses       2169     2181      +12     

Impacted Files	Coverage Δ
.../torque_driven_ocp/pendulum_with_passive_torque.py	65.71% <60.00%> (-5.72%)	⬇️
...amples/torque_driven_ocp/ocp_mass_with_ligament.py	75.75% <75.75%> (ø)
bioptim/limits/constraints.py	83.21% <83.33%> (+0.24%)	⬆️
bioptim/dynamics/configure_problem.py	91.30% <100.00%> (+0.15%)	⬆️
bioptim/dynamics/dynamics_functions.py	94.54% <100.00%> (+0.16%)	⬆️
bioptim/dynamics/ode_solver.py	89.25% <100.00%> (+0.56%)	⬆️
...xamples/getting_started/example_external_forces.py	88.23% <100.00%> (+0.35%)	⬆️
bioptim/interfaces/biomodel.py	100.00% <100.00%> (ø)
bioptim/interfaces/biorbd_model.py	94.79% <100.00%> (+0.03%)	⬆️
bioptim/limits/objective_functions.py	88.71% <100.00%> (+0.05%)	⬆️
... and 4 more

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[pariterre]

Why is there ligament stuff in this PR?

[pariterre]

Reviewed 1 of 8 files at r1, 1 of 3 files at r2, 12 of 12 files at r3, 1 of 1 files at r4, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @AntoineLeroy)

[pariterre]

Reviewed 5 of 5 files at r5, 1 of 1 files at r6, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @AntoineLeroy)

[pariterre]

Reviewed 2 of 3 files at r7, 1 of 2 files at r8, 1 of 2 files at r9, 1 of 1 files at r11, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @AntoineLeroy)