test: update test to use fixtures

Update test-repl-require-context to use fixtures module.

PR-URL: https://github.com/nodejs/node/pull/16799


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>