Werk #1805: Changing roles marks sites where users can login dirty for sync now

Previously a change to the roles did not result in a pending change for remote sites in a distributed WATO setup. To have these changes synchronized one needed to make another change to mark the sites dirty and make the sync possible.

This has been changed now. Each site can now be configured to make "user logins to Web GUI possible", which is enabled by default. Those sites will be marked as dirty now which will make the admin able to trigger a synchronisation right after modifying a role.

To the list of all Werks