Don't normalize file content twice

[3flex]

File content is normalised in createKtFile so there's no need to normalise content before passing the string to that function.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@b017b77). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #2354   +/-   ##
=========================================
  Coverage          ?   82.35%           
  Complexity        ?     2134           
=========================================
  Files             ?      349           
  Lines             ?     6057           
  Branches          ?     1110           
=========================================
  Hits              ?     4988           
  Misses            ?      489           
  Partials          ?      580

Impacted Files	Coverage Δ	Complexity Δ
...lin/io/gitlab/arturbosch/detekt/core/KtCompiler.kt	84.61% <100%> (ø)	6 <0> (?)

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