fix a bug (#48782) (#48800)

(cherry picked from commit 3c78196d0b)

Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>

pkg/services/accesscontrol/ossaccesscontrol/ossaccesscontrol.go

@@ -197,7 +197,7 @@ func (ac *OSSAccessControlService) GetUserBuiltInRoles(user *models.SignedInUser
 	builtInRoles := []string{string(user.OrgRole)}
 
 	// With built-in role simplifying, inheritance is performed upon role registration.
-	if ac.IsDisabled() {
+	if !ac.features.IsEnabled(featuremgmt.FlagAccesscontrolBuiltins) {
 		for _, br := range user.OrgRole.Children() {
 			builtInRoles = append(builtInRoles, string(br))
 		}