fix service bus sample

[karstenjMSFT]

The service bus extension sample has a bug where the Function nameof attribute was cut/pasted from the function above it, causing the sample to not compile because of a duplicate function name. This fixes that.

resolves #issue_for_this_pr

Pull request checklist

• [x ] My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• [x ] My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• [x ] My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• I have added all required tests (Unit tests, E2E tests)
  This extension does not have any tests.

[kshyju]

Thanks @karstenjMSFT