HPCC-13953 Banner does not show in new ECL Watch

Fixes HPCC-13953

Signed-off-by: Gordon Smith <gordonjsmith@gmail.com>

esp/src/eclwatch/HPCCPlatformWidget.js

@@ -200,7 +200,7 @@ define([
             this.activity.watch("Build", function (name, oldValue, newValue) {
                 context.build = WsSMC.parseBuildString(newValue);
             });
-            this.activity.watch("changedCount", function (name, oldValue, newValue) {
+            this.activity.watch("__hpcc_changedCount", function (name, oldValue, newValue) {
                 context.refreshBanner(context.activity);
             });