Fix exclusion pattern for InvalidPackageDeclaration

[cortinico]

Related to #3900
The exclusion pattern for InvalidPackageDeclaration is wrong and should be fixed to '**/*.kts'

[codecov]

Codecov Report

Merging #3907 (75874ca) into main (66f20e7) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 75874ca differs from pull request most recent head e724d9c. Consider uploading reports for the commit e724d9c to get more accurate results

@@             Coverage Diff              @@
##               main    #3907      +/-   ##
============================================
- Coverage     83.55%   83.53%   -0.02%     
- Complexity     3118     3119       +1     
============================================
  Files           456      456              
  Lines          8973     8995      +22     
  Branches       1746     1752       +6     
============================================
+ Hits           7497     7514      +17     
- Misses          564      565       +1     
- Partials        912      916       +4     

Impacted Files	Coverage Δ
.../detekt/generator/printer/rulesetpage/Exclusion.kt	96.66% <100.00%> (ø)
...ls/src/main/kotlin/io/github/detekt/psi/KtFiles.kt	73.52% <0.00%> (-4.25%)	⬇️
...rturbosch/detekt/rules/style/UnusedPrivateClass.kt	73.33% <0.00%> (+3.33%)	⬆️

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