[Bug]: user.css fetched from default user when Comfy started with --multi-user

Prerequisites

• I am running the latest version of ComfyUI
• I have searched existing issues to make sure this isn't a duplicate
• I have tested with all custom nodes disabled (see how)

What happened?

When activating --multi-user in comfy, the front end still tries to fetch user.css from default user.

It should instead probably fetch the actual user one.

Steps to Reproduce

1. start comfy with --mutli-user
2. open comfy and setup your username
3. check network logs and see the 404 on user.css
4. add a default user with a 'user.css`
5. reload
6. notice the error is not there anymore

How is this affecting you?

Minor inconvenience

ComfyUI Frontend Version

1.24.4

Browser

Chrome/Chromium

Console Errors

GET http://localhost:8190/api/userdata/user.css net::ERR_ABORTED 404 (Not Found)

Logs

Additional Context

No response

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