UnnecessaryAbstractClass: false positive when the abstract class has internal/protected abstract members

[t-kameyama]

Fixes #4093

[codecov]

Codecov Report

Merging #4099 (108395a) into main (e0aed91) will increase coverage by 0.01%.
The diff coverage is 80.00%.

@@             Coverage Diff              @@
##               main    #4099      +/-   ##
============================================
+ Coverage     83.58%   83.60%   +0.01%     
  Complexity     3187     3187              
============================================
  Files           459      459              
  Lines          9101     9098       -3     
  Branches       1772     1769       -3     
============================================
- Hits           7607     7606       -1     
+ Misses          561      560       -1     
+ Partials        933      932       -1     

Impacted Files	Coverage Δ
...sch/detekt/rules/style/UnnecessaryAbstractClass.kt	85.36% <80.00%> (+1.27%)	⬆️
...o/gitlab/arturbosch/detekt/rules/KtModifierList.kt	92.30% <0.00%> (+7.69%)	⬆️

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