Fix failing test for AKKF proposal multivariate sampling to compare mean of particle state

[jswright-dstl]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.66%. Comparing base (812d87a) to head (c5a84be).
Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1057      +/-   ##
==========================================
- Coverage   94.10%   93.66%   -0.44%     
==========================================
  Files         204      205       +1     
  Lines       13329    13123     -206     
  Branches     2723     2668      -55     
==========================================
- Hits        12543    12292     -251     
- Misses        532      588      +56     
+ Partials      254      243      -11     

Flag	Coverage Δ
integration	66.47% <ø> (-1.03%)	⬇️
unittests	89.30% <ø> (-0.82%)	⬇️

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