Remove superflous test duplication

[Flamefire]

The template argument in the detail::parser tests is not used so the exact same test is executed multiple times.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.75%. Comparing base (8fbdb8a) to head (8951db1).
Report is 30 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #239      +/-   ##
===========================================
- Coverage    94.76%   94.75%   -0.01%     
===========================================
  Files           69       69              
  Lines         9031     9023       -8     
===========================================
- Hits          8558     8550       -8     
  Misses         473      473              

Files with missing lines	Coverage Δ
test/test_parser.cpp	100.00% <100.00%> (ø)

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