Fix getting shared flags for balance info command (#1905)

main/commands/all/api/balancer_info.go

@@ -48,7 +48,7 @@ func executeBalancerInfo(cmd *base.Command, args []string) {
 	defer close()
 
 	client := routerService.NewRoutingServiceClient(conn)
-	r := &routerService.GetBalancerInfoRequest{Tag: args[0]}
+	r := &routerService.GetBalancerInfoRequest{Tag: cmd.Flag.Arg(0)}
 	resp, err := client.GetBalancerInfo(ctx, r)
 	if err != nil {
 		base.Fatalf("failed to get health information: %s", err)