Fix false positive at EmptyIfBlock

[BraisGabin]

This code was detected as an EmptyIfBlock.

fun f() {
    var i = 0
    if (i == 0) i++;
}

And it's strange but correct. This PR fix it.

[codecov-io]

Codecov Report

Merging #2026 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #2026      +/-   ##
============================================
- Coverage     80.68%   80.67%   -0.01%     
  Complexity     1985     1985              
============================================
  Files           329      329              
  Lines          5591     5590       -1     
  Branches       1021     1021              
============================================
- Hits           4511     4510       -1     
  Misses          539      539              
  Partials        541      541

Impacted Files	Coverage Δ	Complexity Δ
...tlab/arturbosch/detekt/rules/empty/EmptyIfBlock.kt	83.33% <100%> (-2.39%)	9 <0> (ø)

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