Fix websocket auth for managed/custom servers behind using bearer-token auth

[jonlamhk]

Problem

Connecting to a ComfyUI server protected by bearer-token
auth (e.g. ComfyUI-Login) in managed or custom-server mode fails at the initial connection:

ServerError: Could not establish websocket connection at ws://...:
server rejected WebSocket connection: HTTP 200

HTTP requests authenticate correctly (Authorization header is set from
settings.server_authorization in init), but the websocket handshake in
connect() is rejected and redirected to the login page, which comes back as
HTTP 200 instead of a 101 upgrade.

Cause

In ComfyClient.connect(), the initial websocket test builds its args from
self._token:

wsargs = websocket_args(self._token)

self._token is only populated for cloud (Interstice) connections, so in
managed/custom mode it is empty and no Authorization header is sent on the
handshake. The ongoing listener in _listen() already uses the correct value
(settings.server_authorization).

Fix

Use settings.server_authorization (falling back to self._token) so the
handshake carries the same bearer token as the HTTP requests and the
listener:

wsargs = websocket_args(settings.server_authorization or self._token)

Tested against liusida/ComfyUI-Login; the connection now upgrades correctly.