UnusedPrivateMember: highlight declaration name

[t-kameyama]

Fixes #4916

[codecov]

Codecov Report

Merging #4928 (4f78d16) into main (23a03e1) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #4928      +/-   ##
============================================
+ Coverage     84.80%   84.83%   +0.03%     
- Complexity     3488     3512      +24     
============================================
  Files           495      497       +2     
  Lines         11464    11549      +85     
  Branches       2122     2139      +17     
============================================
+ Hits           9722     9798      +76     
- Misses          685      686       +1     
- Partials       1057     1065       +8     

Impacted Files	Coverage Δ
...turbosch/detekt/rules/style/UnusedPrivateMember.kt	92.81% <100.00%> (ø)
...rturbosch/detekt/rules/style/StyleGuideProvider.kt	100.00% <0.00%> (ø)
...bosch/detekt/formatting/wrappers/ImportOrdering.kt	100.00% <0.00%> (ø)
...osch/detekt/rules/complexity/ComplexityProvider.kt	100.00% <0.00%> (ø)
...sch/detekt/rules/bugs/MissingPackageDeclaration.kt	92.85% <0.00%> (ø)
...ch/detekt/rules/complexity/NestedScopeFunctions.kt	90.00% <0.00%> (ø)
...arturbosch/detekt/rules/style/ForbiddenSuppress.kt	84.84% <0.00%> (ø)
...ekt/generator/collection/ConfigurationCollector.kt	62.96% <0.00%> (+0.57%)	⬆️
...arturbosch/detekt/rules/bugs/CastToNullableType.kt	87.50% <0.00%> (+0.83%)	⬆️

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