Fix websockets server shutdown error

- Removed incorrect 'closed' attribute check on websockets Server object
- Added proper exception handling for server shutdown
- Fixed 'Server' object has no attribute 'closed' error during shutdown
- Server now shuts down cleanly without throwing exceptions

wssshd.py

@@ -693,10 +693,12 @@ async def main():
 
         print("\nShutting down WebSocket SSH Daemon...")
 
-        # Close WebSocket server if it's still running
-        if not ws_server.closed:
+        # Close WebSocket server
+        try:
             ws_server.close()
             await ws_server.wait_closed()
+        except Exception as e:
+            if debug: print(f"[DEBUG] Error closing WebSocket server: {e}")
 
         # Cancel cleanup task
         if not cleanup_coro.done():