Fix: Simplify constructor

[localheinz]

This PR

• simplifies a constructor

Follows #1.

[codecov]

Codecov Report

Merging #75 into master will decrease coverage by 0.1%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #75      +/-   ##
============================================
- Coverage      93.4%   93.29%   -0.11%     
  Complexity       77       77              
============================================
  Files             8        8              
  Lines           197      194       -3     
============================================
- Hits            184      181       -3     
  Misses           13       13

Impacted Files	Coverage Δ	Complexity Δ
src/FixtureFactory.php	90.8% <ø> (-0.31%)	37 <0> (ø)

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