assert: loose deep equal should not compare symbol properties

This is the way it's currently documented and that seems appropriate for loose equal assertions. The change was not intentional.

Fixes: https://github.com/nodejs/node/issues/27652

// cc @nodejs/assert

Checklist

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