Werk #15002: Fix "Base on role" default while cloning roles

If you cloned a rule multiple times, from the second clone on, the "Based on role" property had the default "Administrator", no matter what initial builtin role was cloned.

The property will now always show the builtin role of the source role that was cloned. E.g. if you clone "guest" multiple times, the clones will always show "Guest user".

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