compiler: Fix par-tile unfolding behaviour

[FabioLuporini]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 97.10145% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.14%. Comparing base (64d15c5) to head (f27fb76).

Files with missing lines	Patch %	Lines
devito/finite_differences/differentiable.py	92.59%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3041      +/-   ##
==========================================
+ Coverage   84.12%   84.14%   +0.01%     
==========================================
  Files         258      258              
  Lines       56449    56513      +64     
  Branches     4817     4825       +8     
==========================================
+ Hits        47487    47551      +64     
+ Misses       8138     8137       -1     
- Partials      824      825       +1     

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	68.62% <23.33%> (-0.05%)	⬇️
pytest-gpu-gcc-	78.83% <81.15%> (-0.01%)	⬇️
pytest-gpu-icx-	78.76% <81.15%> (+<0.01%)	⬆️
pytest-gpu-nvc-nvidiaX	69.19% <43.90%> (+<0.01%)	⬆️

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