fix(init-1D): #MA-1177 fix exclusions set init for others systems

[Alex-Delaveau]

Describe your changes

Fixed an issue where exclusions were initialized as the French system even when another system was specified.

Checklist tests

Initialize a structure with the holiday system set to 'other'. Then check in "vie-scolaire". The exclusions set should not be set up.

Issue ticket number and link

MA-1177

Checklist before requesting a review (magic string, indentation, comment/documentation...)

• [x] I have detailed the tests to do in my feature/fix in order to prevent consequents regressions (must specify in Checklist tests)
• [x] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation (API Doc etc...) - (must specify in Description for target version)
• [ ] If it is a consequent feature, I have added thorough tests.
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] Any dependent changes have been added to this project (must specify in Description)