[lib] fix creating Tunnelbroker socket

Summary:
ENG-6875.

Previous code was creating multiple sockets on each re-render which was causing issues.

Test Plan: Add credentials and test if connection with Tunnelbroker works.

Reviewers: bartek, michal

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D11237