[FIX] Use repetition time from BIDS metadata instead of nifti header

[Remi-Gau]

• closes ZeroDivisionError: float division by zero when trying to create sidecar #201

[codecov]

Codecov Report

Attention: Patch coverage is 48.14815% with 14 lines in your changes missing coverage. Please review.

Project coverage is 82.34%. Comparing base (1bcca23) to head (8a61d89).
Report is 102 commits behind head on main.

Files with missing lines	Patch %	Lines
bidsmreye/prepare_data.py	10.00%	9 Missing ⚠️
bidsmreye/generalize.py	0.00%	4 Missing ⚠️
bidsmreye/bids_utils.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #218      +/-   ##
==========================================
+ Coverage   79.91%   82.34%   +2.43%     
==========================================
  Files          13       15       +2     
  Lines         926      946      +20     
  Branches      119        0     -119     
==========================================
+ Hits          740      779      +39     
- Misses        144      167      +23     
+ Partials       42        0      -42     

Flag	Coverage Δ
tests	82.34% <48.14%> (+2.54%)	⬆️

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