Replaced state["scaled"] by state.scaled

[pariterre]

This change is 

[codecov]

Codecov Report

Patch coverage: 60.13% and project coverage change: -0.15 ⚠️

Comparison is base (20d6781) 81.26% compared to head (5ed2dbd) 81.11%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #663      +/-   ##
==========================================
- Coverage   81.26%   81.11%   -0.15%     
==========================================
  Files         112      112              
  Lines       12910    12906       -4     
==========================================
- Hits        10491    10469      -22     
- Misses       2419     2437      +18     

Impacted Files	Coverage Δ
bioptim/dynamics/dynamics_functions.py	94.62% <ø> (+0.35%)	⬆️
bioptim/dynamics/ode_solver.py	89.47% <ø> (ø)
bioptim/interfaces/interface_utils.py	83.50% <0.00%> (ø)
...getting_started/example_continuity_as_objective.py	47.43% <33.33%> (ø)
bioptim/optimization/optimization_variable.py	80.71% <46.87%> (-7.22%)	⬇️
bioptim/examples/fatigue/pendulum_with_fatigue.py	82.60% <50.00%> (ø)
...ioptim/examples/fatigue/static_arm_with_fatigue.py	67.85% <50.00%> (ø)
...ptim/examples/getting_started/custom_constraint.py	87.50% <50.00%> (ø)
...ioptim/examples/getting_started/custom_dynamics.py	88.37% <50.00%> (ø)
...ptim/examples/getting_started/custom_objectives.py	84.21% <50.00%> (ø)
... and 35 more

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