OPNSense/core 041d6d6src/www system_usermanager_addprivs.php

warn user about future deprication of "user-config-readonly"

(cherry picked from commit 8a16b40db8d6f63895e5b7a65986c8a133713a64)
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+15-0src/www/system_usermanager_addprivs.php
+15-01 files

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