Refactor RedundantElseInWhen to use compiler warning

[t-kameyama]

No description provided.

[codecov]

Codecov Report

Merging #3214 (c32a882) into master (6fc4609) will increase coverage by 0.02%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##             master    #3214      +/-   ##
============================================
+ Coverage     80.07%   80.09%   +0.02%     
+ Complexity     2642     2640       -2     
============================================
  Files           440      440              
  Lines          8020     8015       -5     
  Branches       1539     1534       -5     
============================================
- Hits           6422     6420       -2     
  Misses          775      775              
+ Partials        823      820       -3     

Impacted Files	Coverage Δ	Complexity Δ
...rturbosch/detekt/rules/bugs/RedundantElseInWhen.kt	83.33% <75.00%> (+12.74%)	5.00 <0.00> (-2.00)	⬆️

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