Fix endpoint to update CaptureSKPs task

ct/go/master_scripts/capture_skps_on_workers/main.go

Index: ct/go/master_scripts/capture_skps_on_workers/main.go
diff --git a/ct/go/master_scripts/capture_skps_on_workers/main.go b/ct/go/master_scripts/capture_skps_on_workers/main.go
index 3306f4f5c80be4a7accd4ad59aacc5929d097515..3216cc9ebfa373c2428d85ebcd9b154fd6df38d8 100644
--- a/ct/go/master_scripts/capture_skps_on_workers/main.go
+++ b/ct/go/master_scripts/capture_skps_on_workers/main.go
@@ -55,7 +55,7 @@ func updateWebappTask() {
 	extraData := map[string]string{
 		"output_link": outputRemoteLink,
 	}
-	if err := util.UpdateWebappTask(*gaeTaskID, util.CaptureSKPsTasksWebapp, extraData); err != nil {
+	if err := util.UpdateWebappTask(*gaeTaskID, util.UpdateCaptureSKPsTasksWebapp, extraData); err != nil {
 		glog.Errorf("Error while updating webapp task: %s", err)
 		return
 	}