Bug: Adding second user breaks all existing connections

[S-Capusta]

When a second SOCKS5 user is created, all existing client configs stop working.
Removing the second user restores functionality for the first user.
Steps to reproduce:

1. Install SlipGate, create user1, generate config, scan resolovers — works fine.
2. Create user2, generate config, scan resolovers.
3. user1 config stops working, user2 config also doesn't work
4. Delete user2 — user1 works again
   Expected: multiple users should work independently.
   Environment: SlipGate v1.5.1, Ubuntu 22.04