Delete Prepared Query Using WriteOptions

[moofish32]

Fixes the issue in #1591 where the Go API for delete prepared query used query options instead of write options

Issues to consider

• This is a breaking change to the signature, we could create an interface abstraction to support some backwards compatibility
• Unit tests pass nil instead of an object here, but more testing is done at the lower levels; do we want to add more tests here?

[moofish32]

@slackpad -- seems like it's merge week, just bumping the PR

[slackpad]

Thanks @moofish32!