mpi: Fix correctness of halo exchanges for Bundles

[FabioLuporini]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 9 lines in your changes missing coverage. Please review.

Project coverage is 91.97%. Comparing base (0c9f18b) to head (f7ff108).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
devito/mpi/halo_scheme.py	50.00%	6 Missing and 1 partial ⚠️
devito/tools/dtypes_lowering.py	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2582      +/-   ##
==========================================
- Coverage   91.98%   91.97%   -0.02%     
==========================================
  Files         244      244              
  Lines       47786    47797      +11     
  Branches     4204     4207       +3     
==========================================
+ Hits        43958    43960       +2     
- Misses       3157     3164       +7     
- Partials      671      673       +2     

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	72.56% <42.85%> (-0.03%)	⬇️
pytest-gpu-nvc-nvidiaX	73.63% <42.85%> (-0.03%)	⬇️

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