UnnecessaryInnerClass: fix false negative with this references

[t-kameyama]

Fixes #4866

[codecov]

Codecov Report

Merging #4884 (05419b1) into main (f66a321) will decrease coverage by 0.03%.
The diff coverage is 60.00%.

@@             Coverage Diff              @@
##               main    #4884      +/-   ##
============================================
- Coverage     84.81%   84.78%   -0.04%     
+ Complexity     3463     3462       -1     
============================================
  Files           493      493              
  Lines         11357    11354       -3     
  Branches       2090     2093       +3     
============================================
- Hits           9632     9626       -6     
  Misses          675      675              
- Partials       1050     1053       +3     

Impacted Files	Coverage Δ
...rbosch/detekt/rules/style/UnnecessaryInnerClass.kt	85.18% <60.00%> (-6.05%)	⬇️

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