Revert "Fix tests"

This reverts commit 93e81d720994bb66a444894484ea02757197299d.
Revert "Get rid of Code#highlighted"

This reverts commit 5599b0a97652cd193d035a75fe58efdf63c18fa4.

And fixes jruby-head.

https://travis-ci.org/pry/pry/jobs/30420112