Fix wrong replacement suggestion for UnnecessaryFilter

[themkat]

Fixes #4806

size is a property/member, not a method/function, and does not take any inputs.

[codecov]

Codecov Report

Merging #4807 (9e9c34c) into main (ca29f28) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main    #4807   +/-   ##
=========================================
  Coverage     84.72%   84.72%           
  Complexity     3426     3426           
=========================================
  Files           491      491           
  Lines         11260    11260           
  Branches       2069     2069           
=========================================
  Hits           9540     9540           
  Misses          674      674           
  Partials       1046     1046           

Impacted Files	Coverage Δ
...arturbosch/detekt/rules/style/UnnecessaryFilter.kt	80.55% <100.00%> (ø)

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