Fix Style/SlicingWithRange offences

Igor Drozdovrequested to merge
id-fix-slicing-with-range into master

What does this MR do and why?

It enables Style/SlicingWithRange Rubocop rule that encourages using endless range for slicing instead of specifying -1

https://www.rubydoc.info/gems/rubocop/RuboCop/Cop/Style/SlicingWithRange

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