Don't report on platform types in NullableToStringCall

[3flex]

Fixes #4059

[codecov]

Codecov Report

Merging #4180 (900e790) into main (3382394) will not change coverage.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##               main    #4180   +/-   ##
=========================================
  Coverage     83.44%   83.44%           
- Complexity     3191     3193    +2     
=========================================
  Files           465      465           
  Lines          9119     9119           
  Branches       1779     1779           
=========================================
  Hits           7609     7609           
  Misses          572      572           
  Partials        938      938           

Impacted Files	Coverage Δ
...turbosch/detekt/rules/bugs/NullableToStringCall.kt	73.80% <0.00%> (ø)

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