Fix interpolation with different smoothing length and inactive particles

[efaulhaber]

No description provided.

[svchb]

/run-gpu-tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.04%. Comparing base (b3f0e7d) to head (fc6ec11).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1226   +/-   ##
=======================================
  Coverage   90.04%   90.04%           
=======================================
  Files         136      136           
  Lines       10595    10595           
=======================================
  Hits         9540     9540           
  Misses       1055     1055           

Flag	Coverage Δ
total	90.05% <100.00%> (ø)
unit	70.77% <100.00%> (ø)

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