MDL-48091 users: revert MDL-42875

Rvert of: "Show only profile visible roles on participants list"

This reverts commit ecc8244e6296f9855924151cea69deeace05e421.
Merge branch 'wip-MDL-48091-m27-2' of git://github.com/marinaglancy/moodle into MOODLE_27_STABLE