fix double websocket connection in dev mode

[rbren]

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In dev mode, the WebSocket connection gets created twice. Seems like this logic broke with the recent refactor--the changes now close the first socket that opens properly

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To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:45713cc-nikolaik   --name openhands-app-45713cc   docker.all-hands.dev/all-hands-ai/openhands:45713cc