[v9.3.x] API: Fix delete user failure due to quota not enabled (grafa…

…na#59879)

API: Fix delete user failure due to quota not enabled (grafana#59875)

(cherry picked from commit 4259b6b)

Co-authored-by: Sofia Papagiannaki <1632407+papagian@users.noreply.github.com>

pkg/services/quota/quotaimpl/quota.go

@@ -33,7 +33,7 @@ func (s *serviceDisabled) CheckQuotaReached(ctx context.Context, targetSrv quota
 }
 
 func (s *serviceDisabled) DeleteQuotaForUser(ctx context.Context, userID int64) error {
-	return quota.ErrDisabled
+	return nil
 }
 
 func (s *serviceDisabled) RegisterQuotaReporter(e *quota.NewUsageReporter) error {