NamedArguments: fix false positive on spread varargs

[t-kameyama]

Fixes #7272

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 84.77%. Comparing base (f0f4727) to head (38fd6c3).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...turbosch/detekt/rules/complexity/NamedArguments.kt	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7283      +/-   ##
============================================
- Coverage     84.77%   84.77%   -0.01%     
- Complexity     3990     3992       +2     
============================================
  Files           578      578              
  Lines         12027    12026       -1     
  Branches       2478     2478              
============================================
- Hits          10196    10195       -1     
  Misses          606      606              
  Partials       1225     1225              

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