fix: restore example simulation in getting started

[Ipuch]

As said in the title

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7043777) 78.72% compared to head (53e60c8) 78.72%.
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #823   +/-   ##
=======================================
  Coverage   78.72%   78.72%           
=======================================
  Files         140      140           
  Lines       15742    15742           
=======================================
  Hits        12393    12393           
  Misses       3349     3349           

Flag	Coverage Δ
unittests	78.72% <ø> (ø)

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[pariterre]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @Ipuch)

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bioptim/examples/getting_started/example_simulation.py line 30 at r1 (raw file):

    X = InitialGuessList()
    X["q"] = [0] * 2
    X["qdot"] = [0] * 2

Please use non-capitalized letter

[pariterre]

Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @Ipuch)