Cleanup Bugs from server.py Sonar Refactor

What does this MR do and why?

• Fix websocket filter function
• Fix bad call to server object update_watcher which got moved to update_manager object.
• Re-add permission check to installer terminal after fixed race condition.
• Fix hytale installer on unix deployments

How to set up and validate locally

• As a general user start a server and make sure the terminal works.
• As a general user start a hytale install then navigate to the terminal and make sure the terminal works.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• Have you checked this doesn't interfere/conflict/duplicate someone elses work?
• Have you fully tested your changes?
• Have you resolved any lint issues?
• Have you assigned a reviewer?
• Have you applied correct labels?