remove unused rbac_has_visible_descendants
remove unused rbac_has_visible_descendants

reference removed 7810f411698c21e0525458d69aac6043f94cf0d6(transferred from ManageIQ/manageiq@0a20a15c06dd72f9df9db9392050d8448ea3de59)

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic