Fix rake prof:slow_cops to return correct results

[fatkodima]

#8962 broke rake prof:slow_cops.

rake prof:slow_cops

Before

     182  (  100.0%)  Array#each
     181  (   99.5%)  Kernel#public_send
  code:

After

       9  (    4.9%)  RuboCop::Cop::Layout::RedundantLineBreak#on_send
       7  (    3.8%)  RuboCop::Cop::Layout::IndentationConsistency#on_begin
       6  (    3.3%)  RuboCop::Cop::Lint::DuplicateMethods#on_def
       6  (    3.3%)  RuboCop::Cop::MethodComplexity#on_def
       5  (    2.7%)  RuboCop::Cop::MultilineExpressionIndentation#on_send
... snip ...

cc @koic

[koic]

Good catch! Thank you!