register user error

[leipeizhao]

Describe the bug register user error

Environment CSGHub Version: v0.9 OS: Linux Hardware: 4c8G Launch: docker compose

To Reproduce Steps to reproduce the behavior:

1. register user test1，login user is ok，logout test1
2. register user test2，login error，error message is：ERROR: duplicate key value violates unique constraint "users_email_key"
3. because the email info is lost in the function "createFromCasdoorUser" in the project csghub-server

Expected behavior A clear and concise description of what you expected to happen.

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