module: check -e flag in debug break setup

When both --debug-brk and --eval are set, and a filename is
specified, its full path is not set correctly, causing an error
for relative filenames with './' omitted.

For example, 'node --debug-brk -e 0 hello.js' throws an error.

Since the script referenced by the filename is never run anyway,
this change skips resolving its full path if both --debug-brk and
--eval are set.

PR-URL: https://github.com/nodejs/node/pull/8876


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>