NamedArguments: fix false positive with varargs

[t-kameyama]

Fixes #3291

[codecov]

Codecov Report

Merging #3294 (833fe13) into master (2e89bd4) will decrease coverage by 0.00%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master    #3294      +/-   ##
============================================
- Coverage     80.02%   80.02%   -0.01%     
- Complexity     2667     2673       +6     
============================================
  Files           443      443              
  Lines          8126     8130       +4     
  Branches       1542     1545       +3     
============================================
+ Hits           6503     6506       +3     
  Misses          796      796              
- Partials        827      828       +1     

Impacted Files	Coverage Δ	Complexity Δ
...turbosch/detekt/rules/complexity/NamedArguments.kt	83.33% <66.66%> (-2.39%)	15.00 <9.00> (+6.00)	⬇️
...lab/arturbosch/detekt/core/FileProcessorLocator.kt	69.23% <0.00%> (ø)	5.00% <0.00%> (ø%)
.../arturbosch/detekt/core/reporting/ReportLocator.kt	92.30% <0.00%> (ø)	4.00% <0.00%> (ø%)

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