Save private users credentials and fix registry migration logic

[cewert]

Add support for saving credentials for private users. Shows the private saved users with the public users on the same view. Ensure userid's are unique so there's no duplicates.

Fix migration logic. I was only updating the logged in user settings previously. This updates all users found in the registry

Changes

• Save private users credentials when asked
  • Show the user select screen if there are public users or saved users for the selected server
  • Make sure all userIds are unique - prevent duplicates when there is a public user with saved credentials
• Fix registry migration logic
  • Update all user settings and not just the logged in user
• Only save active server url to registry when the connection is successful
• Remove deprecated "port" setting

[jellyfin-bot]

This pull request has merge conflicts. Please resolve the conflicts so the PR can be reviewed. Thanks!