Fix Webpack hot module support with HTTPS

What does this Merge Request do and why?

When HTTPS is enabled, TLS is terminated at the NGINX layer, and all backend connections happen over HTTP. We don't need to add extra TLS settings in the NGINX config.

This fixes an issue identified in !2437 (comment 1018030185).

Merge Request checklist

• This change is backward compatible. If not, please include steps to communicate to our users.
• Tests added for new functionality. If not, please raise Issue to follow-up.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.
• Add the ~highlight label if this MR should be included in the CHANGELOG.md.