Fix Wconversion warning in catch_reporter_helpers.cpp

[PB-Ole]

Description

When compiling Catch2 with mingw and -Wconversion flag enabled the catch_reporter_helpers.cpp file fails to build since maxTagCountLen is of type size_t and used as input for std::setw which expects an int as input.

This simply fixes the type of maxTagCountLen which is used nowhere else except for setting the stream width.

GitHub Issues

I did not find an issue mentioning this. If needed, I can create one.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.33%. Comparing base (11a96e1) to head (83d4156).

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #3094      +/-   ##
==========================================
- Coverage   91.36%   91.33%   -0.03%     
==========================================
  Files         204      204              
  Lines        8903     8903              
==========================================
- Hits         8134     8131       -3     
- Misses        769      772       +3     

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