Be sure to drop current_sexp from the hashes
Be sure to drop current_sexp from the hashes

It's not always the first in `hashes`, but `current_sexp` uses the first
of the sorted array, so dropping that one is safe.

Covered by tests here:
https://github.com/codeclimate/codeclimate-duplication/blob/master/spec/cc/engine/analyzers/javascript/main_spec.rb#L41-42

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