Brace style linting

Checklist

• make -j4 test (UNIX), or vcbuild test nosign (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Affected core subsystem(s)

tools lib benchmark test

Description of change

Enable brace-style in ESLint.

Ref: https://github.com/nodejs/node/pull/7094#discussion_r70149215

/cc @trevnorris @silverwind