test: use strictEqual in test-cwd-enoent-repl.js

In file /test/parallel/test-cwd-enoent-repl.js at
line: 26:3 and 27:3 assert.equal was used.

This commit changes use of assert.equal to assert.strictEqual.

PR-URL: https://github.com/nodejs/node/pull/9952


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>