Fix false positive with UnusedPrivateMember on parameter of a protected function

[cortinico]

Fixes #4006

[codecov]

Codecov Report

Merging #4007 (f3b1aef) into main (23ffe7c) will decrease coverage by 0.00%.
The diff coverage is 50.00%.

❗ Current head f3b1aef differs from pull request most recent head 1f9011a. Consider uploading reports for the commit 1f9011a to get more accurate results

@@             Coverage Diff              @@
##               main    #4007      +/-   ##
============================================
- Coverage     83.55%   83.54%   -0.01%     
  Complexity     3179     3179              
============================================
  Files           459      459              
  Lines          9085     9086       +1     
  Branches       1765     1765              
============================================
  Hits           7591     7591              
- Misses          564      565       +1     
  Partials        930      930              

Impacted Files	Coverage Δ
...o/gitlab/arturbosch/detekt/rules/KtModifierList.kt	84.61% <0.00%> (-7.06%)	⬇️
...turbosch/detekt/rules/style/UnusedPrivateMember.kt	91.36% <100.00%> (ø)

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