OptionalWhenBraces: fix false negative when the single statement has comments inside

[t-kameyama]

Fixes #4715

[codecov]

Codecov Report

Merging #4722 (84accef) into main (583ab1e) will increase coverage by 0.00%.
The diff coverage is 75.00%.

@@            Coverage Diff            @@
##               main    #4722   +/-   ##
=========================================
  Coverage     84.71%   84.71%           
- Complexity     3423     3425    +2     
=========================================
  Files           490      490           
  Lines         11255    11256    +1     
  Branches       2069     2069           
=========================================
+ Hits           9535     9536    +1     
  Misses          675      675           
  Partials       1045     1045           

Impacted Files	Coverage Δ
...rturbosch/detekt/rules/style/OptionalWhenBraces.kt	94.11% <75.00%> (+0.36%)	⬆️

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