[Fix]: add missing await

[malhotra5]

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End-user friendly description of the problem this fixes or functionality this introduces.

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Summarize what the PR does, explaining any non-trivial design decisions.
I'm seeing this in the logs

/Users/rohitmalhotra/Library/Caches/pypoetry/virtualenvs/openhands-ai-71T_-94H-py3.12/lib/python3.12/site-packages/fastapi/dependencies/utils.py:638: RuntimeWarning: coroutine 'get_user_id' was never awaited
  solved = await call(**solved_result.values)
RuntimeWarning: Enable tracemalloc to get the object allocation traceback

This PR just adds the missing await

Bug was introduced in #8899

Link of any specific issues this addresses:

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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:59902ea-nikolaik   --name openhands-app-59902ea   docker.all-hands.dev/all-hands-ai/openhands:59902ea