[RTR] prevents further errors in inital guess size

[AntoineLeroy]

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This change is 

[codecov]

Codecov Report

Base: 81.67% // Head: 81.67% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (c3e03b2) compared to base (91ace20).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #617      +/-   ##
==========================================
- Coverage   81.67%   81.67%   -0.01%     
==========================================
  Files         106      106              
  Lines       11805    11804       -1     
==========================================
- Hits         9642     9641       -1     
  Misses       2163     2163              

Impacted Files	Coverage Δ
...xamples/getting_started/example_external_forces.py	87.87% <100.00%> (ø)
bioptim/optimization/optimal_control_program.py	87.13% <100.00%> (-0.03%)	⬇️

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[Ipuch]

@pariterre we forgot to accept this. To clarify this was made to prevent an error due to size of initial guesses that was not raised anymore in init stuff because of the scaling PR. We moved a block to reoder this.

[pariterre]

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