src: use bool literals in TraceEnvVarOptions

[tniessen]

The bit fields are declared as bool fields, yet are assigned integer values.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.51%. Comparing base (9bcfbeb) to head (b07503d).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #61425      +/-   ##
==========================================
- Coverage   88.53%   88.51%   -0.02%     
==========================================
  Files         704      704              
  Lines      208883   208883              
  Branches    40333    40332       -1     
==========================================
- Hits       184926   184894      -32     
- Misses      15934    15976      +42     
+ Partials     8023     8013      -10     

Files with missing lines	Coverage Δ
src/node_env_var.cc	82.21% <100.00%> (ø)

... and 34 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70885/