Fix np.mean for StateVectors

[sdhiscocks]

Previously unusable due to incorrect arguments being passed

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 🎉

Comparison is base (bf40a9a) 94.87% compared to head (970f1da) 94.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #788      +/-   ##
==========================================
+ Coverage   94.87%   94.90%   +0.03%     
==========================================
  Files         176      176              
  Lines        9757     9757              
  Branches     1938     1938              
==========================================
+ Hits         9257     9260       +3     
+ Misses        356      353       -3     
  Partials      144      144              

Flag	Coverage Δ
integration	68.27% <0.00%> (-0.02%)	⬇️
unittests	89.93% <100.00%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
stonesoup/types/array.py	88.28% <100.00%> (+2.34%)	⬆️

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