Clone options

[abursavich]

opts = &*opts is a no-op.

See: https://staticcheck.io/docs/checks#SA4001

[nhooyr]

Nice catch! Can confirm. I tested it at the time and thought it worked but I guess I got confused.

[nhooyr]

Thanks for contributing @abursavich!

[icholy]

There are still 2 more instances of this.

$ git grep "\&\*
dial.go:        copts = &*copts
internal/test/wstest/pipe.go:   dialOpts = &*dialOpts

[nhooyr]

Good eye @icholy, I've made note of those in my TODO and will have a PR up to fix shortly.