fix: correctly handle disabling rules with false

[incendial]

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[X] Bug fix
[ ] New rule
[ ] Changes an existing rule
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

[github-actions]

Dart Code Metrics unused files report of dart_code_metrics. ✅

Summary

• Scanned package folders: bin, example, lib
• No unused files found! ✅

[github-actions]

Dart Code Metrics analyze report of dart_code_metrics. ✅

Summary

• Scanned folders: bin, example, lib, test

• Total scanned files: 421

• Total lines of source code: 7405

• Total classes: 288

• Average Cyclomatic Number per line of code: 0.35

• Average Source Lines of Code per method: 6

• Total tech debt: 1302.0 hours

• Found issues: 6 ⚠

[codecov]

Codecov Report

Merging #822 (0e07796) into master (43a293a) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #822      +/-   ##
==========================================
+ Coverage   87.26%   87.27%   +0.01%     
==========================================
  Files         277      277              
  Lines        5898     5903       +5     
==========================================
+ Hits         5147     5152       +5     
  Misses        751      751              

Impacted Files	Coverage Δ
...ib/src/config_builder/models/analysis_options.dart	91.66% <100.00%> (+0.62%)	⬆️

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