debug: terminal constraint now works with MultipleShooting + NonLinModel

[franckgaga]

Correct version (terminal state constraint are treated as linear constraints, as it should be for NonLinModel with non-SingleShooting transcription)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.12500% with 3 lines in your changes missing coverage. Please review.

Project coverage is 98.82%. Comparing base (31cac69) to head (85f89ff).

Files with missing lines	Patch %	Lines
src/controller/transcription.jl	98.07%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #176      +/-   ##
==========================================
- Coverage   98.85%   98.82%   -0.04%     
==========================================
  Files          25       25              
  Lines        4122     4166      +44     
==========================================
+ Hits         4075     4117      +42     
- Misses         47       49       +2     

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