full string as method for ode solvers

[Ipuch]

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[pariterre]

LGTM
Good catch :)

[codecov]

Codecov Report

Merging #415 (b3630d1) into master (fd01562) will decrease coverage by 0.05%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #415      +/-   ##
==========================================
- Coverage   80.62%   80.57%   -0.06%     
==========================================
  Files          81       81              
  Lines        8398     8407       +9     
==========================================
+ Hits         6771     6774       +3     
- Misses       1627     1633       +6     

Impacted Files	Coverage Δ
bioptim/dynamics/ode_solver.py	87.50% <33.33%> (-5.14%)	⬇️

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