Facet pivot stats fields overwritten when calling getFacetSet()

[thomascorthals]

Fixes #1059.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a9714d3) 97.49% compared to head (3402828) 97.49%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1102   +/-   ##
=======================================
  Coverage   97.49%   97.49%           
=======================================
  Files         389      390    +1     
  Lines       10141    10147    +6     
=======================================
+ Hits         9887     9893    +6     
  Misses        254      254           

Flag	Coverage Δ
unittests	97.49% <100.00%> (+<0.01%)	⬆️

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Files	Coverage Δ
src/Component/ResponseParser/FacetSet.php	88.62% <100.00%> (+0.20%)	⬆️
...t/ResponseParser/NormalizeParsedJsonStatsTrait.php	100.00% <100.00%> (ø)
src/Component/ResponseParser/Stats.php	100.00% <100.00%> (ø)
src/Component/Result/Stats/Stats.php	100.00% <100.00%> (ø)

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