test: remove `&socket` from test_inspector_socket

Checklist

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

Affected core subsystem(s)

test

Description of change

What is socket, where did it came from? We don't know.

On a more serious note: socket is function from sys/socket.h. There is no way casting it to structure could yield any useful results.

R= @nodejs/v8