Fix reporters not being disabled when requested

[cschreib]

Fixes #185.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.03%. Comparing base (ecfa3d6) to head (760dda6).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #187   +/-   ##
=======================================
  Coverage   94.03%   94.03%           
=======================================
  Files          29       29           
  Lines        1709     1709           
=======================================
  Hits         1607     1607           
  Misses        102      102           

Flag	Coverage Δ
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Files with missing lines	Coverage Δ
src/snitch_reporter_catch2_xml.cpp	95.89% <ø> (ø)
src/snitch_reporter_teamcity.cpp	100.00% <ø> (ø)

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