mpi: fix halo ispace with subdomains

[mloubout]

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Codecov Report

❌ Patch coverage is 18.75000% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.37%. Comparing base (3539fd4) to head (fe15a66).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
tests/test_subdomains.py	13.33%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2908      +/-   ##
==========================================
- Coverage   83.40%   83.37%   -0.04%     
==========================================
  Files         248      248              
  Lines       51647    51662      +15     
  Branches     4459     4459              
==========================================
- Hits        43075    43071       -4     
- Misses       7818     7835      +17     
- Partials      754      756       +2     

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	68.70% <100.00%> (ø)
pytest-gpu-gcc-	77.98% <18.75%> (-0.04%)	⬇️
pytest-gpu-icx-	77.61% <18.75%> (-0.01%)	⬇️
pytest-gpu-nvc-nvidiaX	69.23% <100.00%> (ø)

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[FabioLuporini]

test?

[FabioLuporini]

Patch is good, but we need a test