Synchronize use of root extension point

[arturbosch]

Closes #2433

[codecov-io]

Codecov Report

Merging #2479 into master will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #2479   +/-   ##
=========================================
  Coverage     83.28%   83.28%           
  Complexity     2196     2196           
=========================================
  Files           360      360           
  Lines          6216     6216           
  Branches       1141     1141           
=========================================
  Hits           5177     5177           
  Misses          463      463           
  Partials        576      576

Impacted Files	Coverage Δ	Complexity Δ
...b/arturbosch/detekt/api/internal/DetektPomModel.kt	70.58% <100%> (+1.83%)	5 <0> (ø)	⬇️
...b/arturbosch/detekt/cli/baseline/BaselineFacade.kt	89.47% <0%> (-0.53%)	10% <0%> (ø)

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