Fix `kinetic_energy` for TLSPH

[LasNikas]

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 71.28%. Comparing base (ceee740) to head (7395396). :warning: Report is 14 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #899      +/-   ##
==========================================
- Coverage   71.31%   71.28%   -0.03%     
==========================================
  Files         107      107              
  Lines        7146     7139       -7     
==========================================
- Hits         5096     5089       -7     
  Misses       2050     2050              

Flag	Coverage Δ
unit	71.28% <100.00%> (-0.03%)	:arrow_down:

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