[MINOR] Fix "goroutine won't stop" - NDF

MERGE REQUEST

MR Guidelines

Overview

This MR fixes the "goroutine won't stop" NDF.

Proof: https://gitlab.com/NebulousLabs/Sia/-/jobs/1080031552

Checklist

Review and complete the checklist to ensure that the MR is complete before assigned to an approver.

• All new methods or updated methods have clear docstrings
• Testing added or updated for new methods
• Any new packages are added to Makefile and .gitlab-ci.yml
• API documentation updated for API updates
• Module README.md updated for changes to workflow
• Issue added to Sia-UI repo for new supporting features
• Changelog File Created

Issues Closed