Werk #12865: Fix possibility to overwrite selections of other users

If a user with less permissions edited a duallist element (two lists with interchangable elements) like e.g. the "Match site" criteria in event console rules, the user could overwrite previously set values of users with more permissions, because he was not able to see elements he is not permitted for.

The count of such elements will now be shown as "3 locked sites" entry in the "Match site" criteria of event console rules. This entry is disabled and can not be moved to unselected.

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