test: correct labelling of asserts errors

test/parallel/test-tls-over-http-tunnel.js contains assertions where the first value is the expected value and not the tested value.

This PR fix that in order to provide correct AssertionError labelling.

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