Fixed Groups without Owners

When an account is merged then the group ownership is lost. So now I have groups without owner.
I also cannot invite the owner to the group again or make the user group owner again.

How to solve this?

This is related to these bugs:
https://nobita.me/threads/merge-account-does-not-transfer-group.1453/
https://nobita.me/threads/admin-cannot-invite-members.1452/

I see that the table xf_team has the usename and userid of the old user account.

Fixed.