fix: consolidate WS proxy Bearer header guard to single line for CI test

The source-inspection test checks each line individually for an 'if'
guard. The multi-line formatting of the 'if remote_key else {}' guard
split it across 3 lines, making the test see an unguarded header.
Consolidated to match the single-line pattern of the other 4 endpoints.

muxplex/main.py

@@ -785,9 +785,7 @@ async def federation_terminal_ws_proxy(websocket: WebSocket, remote_id: int) ->
         async with websockets.connect(
             ws_url,
             subprotocols=[Subprotocol("tty")],
-            additional_headers={"Authorization": f"Bearer {remote_key}"}
-            if remote_key
-            else {},
+            additional_headers={"Authorization": f"Bearer {remote_key}"} if remote_key else {},
             ssl=ssl_context,
         ) as remote_ws: