[BUG] Superfluous response.WriteHeader call in contrib net/http

[nakkamarra]

Version of dd-trace-go
1.66.0

Describe what happened:
In this code block the custom responseWriter type is writing a 200 OK with a call to WriteHeader, but the net/http stdlib already does this, so the subsequent call to Write afterwards will attempt to do this again causing the stdlib to complain with a message to stdout

Describe what you expected:
No error logs from the stdlib package

Steps to reproduce the issue:
Call TraceAndServe from within a server (will update with code example)

[nakkamarra]

Actually, after reviewing the reproduction code I wrote, it seems to just be an issue in my original code 🤦