Fix Quart WebSocket close test app - add missing accept()

WebSocket connections must be accepted before they can be closed.
Added await websocket.accept() before await websocket.close(code).

tests/docker/asgi_framework_compat/frameworks/quart_app/app.py

@@ -206,5 +206,5 @@ async def ws_close():
         if param.startswith("code="):
             code = int(param.split("=")[1])
             break
-    # Quart uses a different close mechanism
+    await websocket.accept()
     await websocket.close(code)